I like the idea, but the centralized platform means it would be hard to buy/sell drugs, sex and contraband, which would make it <i>really</i> interesting :) I'd also like to see a bidding component; for example, head to the Apple store on a big launch day, and bid for an iPad 3/iPhone 5--those at the front of the queue could make a tidy profit, and those with deeper pockets could skip the queue.