Not yet, but now that it has been shown there is a limit to the resource, some will be exploring making money that way, as some do with reselling Gen Con new games on ebay minutes into the Vendors opening and selling out.If the badges are transferable, then Gen Con has to get ahead of watching someone buy 50 or a thousand badges and hawking them on Amazon for double the price.
I assume Gen Con has the non-transferable policy for this reason. They want to sell to registrants, not to scalpers.
about 8 years ago when the football stadium was still attached to the convention center they had an exhibition game on the Saturday of Gencon. Thousands of Colts fans flooding the area with Thousands of gamers. A friend and I were walking from the Embassy to the convention center and saw scalpers on nearly every corner one of the scalpers offered us tickets to the game and when we declined he stopped us and asked us "whats with all these people with backpacks and why are they headed to the stadium? " none of them were interested in buying tickets and he was curious as to what the heck was going on. We had to laugh at told him about Gencon and he would have better luck with True Dungeon tickets :P.
It always struck me as funny that someone who made money scalping tickets had no idea what events were going on in the area. So I don't think we are going to have scalping problems at Gencon, I don't even think it would occur to most scalpers we are even a market...yet. Next year I think it will be back to normal and won't sell out and the scalpers will have missed thier opportunity.