Wolf&Grayson EditorialSeller acquisition is often the most misunderstood phase of marketplace growth. Metrics can look strongest at the exact moment risk increases because new supplier accounts are easy to count but harder to evaluate. A rapid influx of sellers can disguise deeper problems, including incentives that distort behavior or onboarding bottlenecks that slow real activation. Often, early trust gaps only surface once transactions begin. From American Express to StubHub to SeatGeek, Bobby J. Graham has operated inside these marketplaces at key moments in seller growth. For Graham, seller acquisition is a quality and trust problem that, when solved, turns messy operations into a compounding growth engine.
“You have to earn the right to onboard sellers,” he says. “In any marketplace, you can acquire buyers at some level of efficiency, but sellers are really hard,” he says. “And if you try to force sellers into your ecosystem, it does get really expensive.”
There’s an easy temptation to shortcut the problem by paying sellers to show up, flood the funnel with leads, and celebrate the line going up and to the right. The issue is that incentives can purchase activity, but they rarely purchase real buy-in. “You can give sellers incentives to get them to come on and growth hack your way through and find tactics,” he says. “But you’re always going to damage the ecosystem if you do it. It’s not sustainable.”
The core mistake is confusing acquisition with adoption. A seller can accept an incentive, list inventory, and still remain unconvinced that the marketplace will generate meaningful demand. If that seller churns quickly or delivers poor outcomes, the marketplace has funded its own instability.
Demand is the permission slip
Graham’s “earn the right” framing is a reminder that supply doesn’t join on promise alone. It joins when the other side of the market is real, visible, and valuable.
At American Express, he worked on the merchant side and watched how demand rewires a seller’s calculus. A restaurant might hesitate to accept a payment method with higher fees until it sees a measurable return in spend and customer value. “You have enough card members to make it worth it for me to take you as an American Express merchant,” Graham says.
The same logic applies to ticketing. In a mature category, sellers have options, and incumbents typically own the default buyer demand. “I’m a ticket broker. Why would I sell on SeatGeek if all my buyers come from StubHub?” he says.
The seller pitch must be about providing proof that the marketplace already attracts the right buyers. Demand quality matters as much as demand volume. Sellers want educated, ready purchasers and fewer time-wasting interactions.
Trust systems beat incentives
Even when demand exists, seller acquisition can still burn cash if the trust layer is thin. “The trust that you build with sellers is the most important thing,” he says. It starts with onboarding velocity and clarity. Sellers have businesses of their own and will not tolerate unnecessary friction. “If the friction to get into that ecosystem is too high, then they just won’t do it,” Graham says. The marketplace’s internal experience matters too: whether teams can communicate effectively, understand seller pain points, and resolve disputes with consistent standards.
Disputes are a defining moment because every marketplace is forced to make a judgment call. “American Express always gets bashed for siding with a card member in a dispute,” Graham says. The issue is not that one party benefits more often than the other, but that the rules are clear, consistently applied, and understood before a problem arises. Sellers can tolerate unfavorable outcomes if they trust the process behind them. When that trust is missing, marketplaces try to compensate with higher acquisition spend, using incentives and volume to paper over credibility gaps that eventually resurface.
Three levers that keep costs down and quality up
Graham boils efficient seller acquisition into three levers that work together.
- First, say no. “There are sellers that you don’t want on your platform,” he says. Many marketplaces treat seller acquisition as a volume problem, but Graham pushes for a clear definition of an ideal seller, an operational avatar the whole organization can align around. The more disciplined the criteria, the less money gets wasted chasing poor-fit supply.
- Second, pull sellers in with quality demand. The message should be about the buyer side, not about promises of future scale. “Your pitch needs to be about the other side of that ecosystem,” Graham says, emphasizing the difference between raw traffic and serious buyers, because the seller experience is shaped by who shows up.
- Third, document the system so it can scale beyond a single operator. “Teams burn out when all of the work lives in one person’s head,” he says. He learned this lesson while scaling SeatGeek. He could onboard sellers quickly himself, but speed did not translate into scale until he “got it out of my head and put it on paper,” then trained others to execute consistently. “You don’t know it until you can teach it.”
The next wave still depends on humans
Graham expects AI to transform the cheapest part of seller acquisition by dramatically improving how prospects are identified. “AI will speed up the prospecting, but it will never close the deal,” he says. Relationship, judgment, and trust remain human work, especially in categories where sellers already have distribution.
Automated onboarding at scale can erode the very trust a marketplace needs to differentiate when product features converge. “When product is no longer a differentiator, the only thing that people care about is trust,” he says. He points to the difference between platforms that provide transactional protection and those that don’t. The reason buyers choose a trusted marketplace over a listing site is the same reason sellers stay. They are not just buying software. They are buying an operating system for credibility.
At SeatGeek, Graham translated that into measurable outcomes. By tightening screening, strengthening seller relationships, and managing expectations between buyers and sellers, the company reduced its “broken order rate” from 2% to below 0.5%.
Seller acquisition becomes a growth engine when the marketplace can prove demand, enforce standards, and deliver trust at scale. Cash cannot substitute for those fundamentals. It can only hide their absence.
