AI PPC Management vs Agency: Cost Models and What to Measure

The short answer

"AI PPC management" is not an alternative to an agency in the way it is often sold, because modern Google Ads accounts already lean on machine learning. Google Ads Help describes its Smart Bidding strategies, such as Target CPA and Target ROAS, as setting a bid for each auction automatically. The real question is who decides what the automation optimises for, feeds it good data, and checks it is not wasting money. That can be you, a software tool, an agency, or a managed service.

If you have the time and some paid search skill, running platform automation yourself is often the cheapest sound option. If you spend enough that small percentage improvements matter and you lack the time, a good agency or managed service usually earns its fee. PPC software helps people who already know what they are doing to do it faster.

Four ways to run PPC

Four ways to manage pay-per-click advertising

Criterion	Platform automation yourself	PPC software tool	Agency	Managed AI-supported service
Who sets goals and conversion data	You	You, with the tool's suggestions	The agency, with your input	The operator, with your input
Typical way it is paid for	Your time only	Subscription, sometimes tiered by ad spend	Percentage of spend, flat monthly fee or a mix	Fee for the managed service
Skill required from you	High	Medium to high	Low; you approve and supply business data	Low; you supply context and decisions
Strength	Cheapest; full control	Faster audits, alerts and bulk changes	Specialist depth, often several people	One accountable operator across ads, landing pages and tracking
Main risk	Optimising to the wrong conversion; neglect when busy	Following automated recommendations without judgement	Percentage-of-spend fees reward higher spend; junior account handling	Capacity of one operator on very large or many-market accounts
Best fit	Small budgets with in-house skill	In-house marketers managing several accounts	Large or complex accounts across many campaigns	Small and mid-sized advertisers wanting ads, pages and measurement run together

A note on percentage-of-spend fees: they are common and not wrong, but they give the manager a reason to recommend higher budgets. Ask how the fee would change if the right answer were to spend less.

The measure that settles the comparison

Cost per lead (CPL) on its own is a poor way to compare managers, because cheap leads are often poor leads. Compare on cost per qualified lead and, if you can, cost per sales opportunity, including the people and tool costs of running the account, not just the media.

Calculator

Cost per lead calculator

Work out what a lead, a qualified lead and an opportunity really cost once people and tools are included.

Monthly media spend (£)Monthly people cost (£)Monthly tools cost (£)Leads per monthShare that are qualified (%)Share of qualified that become opportunities (%)

The starting figures are illustrative round numbers, not AfM prices or client results. Replace them with yours.

Total monthly cost

£5,900

Media plus people plus tools

Cost per lead

£98.33

Total cost divided by all leads

Cost per qualified lead

£245.83

Total cost divided by 24 qualified leads

Cost per opportunity

£819.44

Total cost divided by 7.2 opportunities

Assumptions

• Media-only cost per lead understates the true cost; people and tools are included here.
• Use the same qualification definition every month, or the trend means nothing.

Worked example

Illustrative example with round, hypothetical figures. Two ways of running the same account for a month.

Option A:

• • Media spend £5,000, management £1,500, tools £200: total £6,700.
• • 100 leads, of which 40% are qualified (40), and 25% of qualified leads become opportunities (10).
• • CPL: £6,700 ÷ 100 = £67. Cost per qualified lead: £6,700 ÷ 40 = £167.50. Cost per opportunity: £6,700 ÷ 10 = £670.

Option B, which looks better on the headline number:

• • Same total cost, £6,700.
• • 150 leads, but only 20% qualified (30), and 25% of those become opportunities (7.5).
• • CPL: £6,700 ÷ 150 = £44.67. Cost per qualified lead: £6,700 ÷ 30 = £223.33. Cost per opportunity: £6,700 ÷ 7.5 = £893.33.

Option B wins on CPL by a third and loses on cost per opportunity by a third. To check either option in the calculator, enter the management fee as the people cost (for Option A: media £5,000, people £1,500, tools £200, 100 leads, 40% qualified, 25% to opportunities). A manager, human or software, optimising only for form fills will drift towards Option B.

Feed the automation the right goal

The single most valuable thing any PPC manager can do is tell the platform which conversions matter. Google Ads Help describes ways to send conversions from your CRM back to the platform (offline conversion imports, and enhanced conversions for leads, which Google has presented as the simpler route for many advertisers), so bidding can learn from qualified leads and sales rather than raw form submissions. Setup options change, so check Google's current guidance before choosing one. Ask any agency, tool or service how they will set this up for your account. If the answer is vague, the automation is optimising for volume.

Keep control of the account

Whoever runs your PPC, the account should belong to your business. Google Ads has distinct user access levels, and your business should hold the highest one (Google Ads Help calls it Admin) so it can add or remove managers at any time; check the current list of levels in Google's help centre when you set this up. Agencies often work through a manager account, which is fine as long as the underlying ad account and its billing are yours.

How to choose

1. • Work out your current cost per qualified lead with the calculator, including your own time at a fair rate.
2. • Ask each option how it would improve that number, not the CPL.
3. • Ask who checks the automated recommendations before they are applied.
4. • Confirm account ownership and how you would leave.
5. • Pick the option whose answers you understand and whose incentives line up with yours.

AfM runs paid search as part of one managed marketing service: the AI operating system supports analysis, ad variations and reporting, and the founder recommends budgets, goals and tests, with the client approving any change to spend. For a published example of long-running paid media management, see the enterprise technology platform paid media case record, work Jakub delivered as a freelance consultant before founding AfM, which covers LinkedIn and Meta rather than search. For search-specific help, read precision Google Ads with AI.

FAQ

Is Performance Max a replacement for a PPC manager?

It automates bidding, placements and some creative assembly across Google's channels, but it still depends on the goals, conversion data, audience signals and creative you give it. Someone has to set those well and check where the budget is going.

Should I accept a percentage-of-spend agency fee?

It can be reasonable, especially on large accounts. Ask for a cap or a flat element, and ask how the agency would advise you if the right move were to reduce spend. Their answer tells you whose interest the model serves.

How long before I can judge a new PPC manager?

Give enough time for bidding to adjust after major changes and for leads to become opportunities in your sales cycle. Agree the review date and the measure at the start so the judgement is not made on a single good or bad week.

Do PPC software tools make bidding decisions themselves?

Some apply rules or recommendations automatically; most support a person making changes faster. Check which actions a tool takes without approval, and switch off any you would not accept from a junior colleague unsupervised.