The first thing to understand about the small-agency M&A market is that, for most owners, there is no market. About 84% of U.S. independent agencies generate between $250,000 and $1.5 million in commission revenue — the squeezed middle — and the professional infrastructure of a real sale process is largely closed to them. This is the Brokerage Gap, the most foundational of the market's structural failures, and the one that determines who even gets to participate. This piece explains the economics that hold it in place and what it actually costs the agencies caught inside it.
§ 01 · The mismatchWhy brokers decline small deals.
The Gap is structural, not malicious. Traditional advisory firms are staffed with senior bankers, attorneys, and analysts whose hourly cost makes small deals unprofitable. The marginal cost of executing a $1M deal is barely lower than a $5M deal — the legal work, the diligence coordination, the negotiation are nearly identical — but the revenue is one-fifth. No rational firm staffed that way stays in the segment. So the market self-selects: a $5M enterprise-value minimum quietly fences out the squeezed middle, and even self-described "small-friendly" boutiques steer sub-$1.25M owners toward do-it-yourself sales.
Two mechanisms reinforce the exclusion. The non-refundable retainer ($5,000–$50,000 at signing) doubles as a filter — it signals seller seriousness and underwrites the broker's risk of a deal that never closes, transferring all financial risk to the party least able to absorb it. And the opacity of fee structures — tiered "double Lehman" formulas, hybrid step-downs, minimum-fee floors — makes blended pricing nearly impossible to comparison-shop, suppressing competitive pressure on price.
§ 02 · What it costsThe equity erosion.
For the excluded owner, the cost shows up as a binary choice: pay-to-play with a broker who may not close, or sell unrepresented into a buyer-led process. Both are expensive. The traditional model on a $2M sale runs roughly $225,000 all-in.
| Cost on a $2M sale | Traditional broker | Flat 3%, on close |
|---|---|---|
| Upfront retainer | $5,000–$50,000 | $0 |
| Success fee | 6%–12% | 3% |
| Total transaction cost | ~$225,000 | ~$60,000 |
| Paid | Win or lose | On close only |
The gap between those two columns — about $165,000 on a $2M agency — is equity erosion: value the owner created, lost to the structure of the advisory market rather than to anything about the agency itself. (Third-party legal, escrow, and closing costs still apply in either model.) For an owner whose retirement is the agency, that is not a rounding error.
The squeezed middle faces the cruelest version of the problem: too small for a broker to bother with, too valuable to give away. "You can't afford to sell, and you can't afford not to" is the lived reality of the 84%.
§ 03 · Why incumbents can't fix itThe cost-base trap.
A traditional firm that simply lowered its minimums and dropped its retainer would face immediate margin collapse — its senior-staffing, office, and partner-compensation cost base does not flex down with deal size. To serve sub-$5M agencies profitably at a flat 3%, a firm would need to multiply deal volume per banker several times over, which is operationally impossible without automation it does not own. The Gap, in other words, cannot be closed by the firms that created it. It can only be closed by a cost base built for small deals from the start.
§ 04 · What closes itA small-deal-native model.
Closing the Gap requires inverting the broker economics: replace the senior-banker cost base with automation that absorbs valuation, listing preparation, buyer matching, and document organization, then charge only when a deal actually closes. That is the model behind a marketplace like Milly Books — a flat 3% success fee paid on close, zero upfront cost, no enterprise-value minimum, with the work that used to require a banker handled by software. The incentive aligns by construction: paid-on-close means the platform earns nothing unless the seller does.
One corollary matters for the smallest owners: because the model has no deal-size floor, it can transact things the legacy channel cannot — including a fractional sale of part of the book (a "slice"), a transaction a traditional broker has no economic reason to touch. The companion friction-points playbook covers how the Gap plays out in practice for buyers and sellers, and the other three foundational failures — valuation fog, the disclosure dilemma, and deal drag — describe what happens to the sellers who do make it into the process.
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Terminology on this shelf
- Brokerage Gap
- The systemic exclusion of small and mid-sized agencies from professional M&A advisory, driven by small-deal economics.
- Squeezed middle
- The ~84% of independent agencies at $250K–$1.5M in annual commission revenue.
- Enterprise-value minimum
- The ~$5M floor below which legacy brokers won't engage.
- Non-refundable retainer
- A $5K–$50K upfront fee that screens sellers and shifts deal-failure risk onto them.
- Equity erosion
- Value lost to the cost structure of the advisory market — about $165K on a $2M sale versus a flat-3% model.
- Success fee
- A fee paid only when a deal closes and funds are wired.