It’s similar to rampant doping in competitive sports, where everyone knows what’s going on. When there are millions of dollars at stake in contracts, prize money, and sponsorships, people will cheat and take risks. Even if they’re caught, the payoffs are usually greater than consequences.
The incentives and payoffs are far, far greater than any type of consequences to the seller. Worst case, they can shut down and start another shill store.