Stubhub can charge a violating seller.<p>Or, <i>try to</i>.  Stubhub actually has a huge fraud exposure.  The seller is paid within days of the buyer receiving the tickets, even if the event is much later.<p>If the tickets were counterfeit in the first place, or invalidated later, Stubhub can only hope that the credit card the seller signed up with is still valid... or <i>ever was</i>.  Meanwhile, the buyer gets a refund (eventually) or a substitute (if prices have dropped).