Just looking at StubHub, the most I see at a performance is 35, a few 20s, lots of 2-8s, and even more 0s. Lets say each performance has has 35 seats up there, thats about 2.5% of seats that were taken by scalpers. Not a perfect system, but an overwhelming majority of these seats, I would say nearly all, went to fans. Of course, those numbers may fluctuate, but I think the system works, flaws and all.