Comparing a flat monthly PPC fee against a percentage of ad spend for seller leads

Question

Two common pricing structures for a real estate PPC agency are worth laying side by side before assuming either is cheaper. One shop charges $2,000 a month flat with ad spend billed separately, straight to the platform. The other charges 15 percent of ad spend with a $5,000 monthly minimum spend requirement, and runs the account through its own agency login rather than the client's. On the surface, $2,000 flat against 15 percent of $5,000, which is $750, makes the percentage model look far cheaper. That gap is usually the sign of a missing variable rather than an actual bargain. Running the account under the agency's own login affects who owns the campaign history and audience data if the relationship ends, and a minimum spend requirement effectively sets a price floor of $5,000 a month regardless of results. A fair comparison has to account for account ownership and the enforced minimum spend before the two numbers can be judged against each other at all, and it is worth asking directly whose name the ad account sits under before treating either number as the real cost.

Rena Guide · Accepted Answer

You're comparing two different fee shapes, and the sticker numbers don't line up because one of them scales with your spend.

A flat retainer is a fixed monthly management fee. $2,000 a month whether you spend $1,000 or $20,000 on ads. A percentage-of-spend fee is a management fee calculated as a share of what you put into the ad platforms. At $5,000 spend, 15% is $750. At $20,000 spend, it's $3,000. So the second proposal is cheaper today and more expensive the moment the campaign scales, which is the point at which most people are happiest with their agency and least likely to renegotiate.

Ad spend is the money that goes to Google or Meta. That's not the agency's revenue, it's the cost of the clicks. So your true monthly outlay in the second case is $5,000 plus $750, not $750.

The account ownership answer matters more than either fee. If the Google Ads account sits inside the agency's own account and you leave, you can lose the campaign history, the conversion data, and the negative keyword list you paid months to build. Platforms let an agency manage an account you own, through a manager account link, with billing still on your card. Ask for that in writing before signing, along with a clean statement that the landing pages, the phone numbers, and the lead data are yours on exit. Agencies that say no to this are telling you something.

joe_delgado5 · Answer

The 15% deal is the one that bites. I've watched people go from $5k spend to $25k spend inside a year because the campaign was working, and suddenly the management fee is $3,750 for roughly the same amount of work the agency was doing at $750. Flat fee gets ugly the other direction, at $1,500 total spend you're paying more in fees than in clicks.

monica_tran3 · Answer

Anyone who has run a service business for a stretch learns that percentage-of-spend changes whose interest is whose, without anyone announcing it. Said plainly: the agency's revenue goes up when the budget goes up, and there's no built-in reason for them to flag that the ninth thousand dollars converts worse than the first. A flat fee at least keeps that conversation neutral. Ask either shop what happens to the fee if they recommend cutting spend in half.

angela_burke · Answer

On the phone numbers @rena-guide mentioned, get specific about the call tracking numbers too. If they're provisioned inside the agency's CallRail or similar, those numbers go with the agency, and any marketing already out in the world pointing at that number goes dead. Porting is possible but it's a two week hassle at exactly the worst moment. Client-owned subaccounts avoid this problem entirely, which is why it's worth insisting on one.

angela_burke · Answer

Also worth asking the second agency what the $5,000 minimum spend buys in a given market. In a metro where seller-intent clicks run $30 to $60, $5,000 is somewhere around 100 clicks a month. That's a small sample to judge anyone on before committing to a structure.

Comparing a flat monthly PPC fee against a percentage of ad spend for seller leads

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