I just visit a couple of deal sites myself whenever I look to purchase something. A Deals section could get some traffic, but I really doubt it'd be anything more than looking at CAG and maybe SD and posting some threads from there. I know at SD when people posting deals from CAG and don't credit the OP at CAG some people get upset, though I think that has more to do with them getting a lot of +rep. This site has none of that so that probably wouldn't be much of an issue.
The only problem I can think of with a trading outlet is younger people would have much more limited access to credit cards and Paypal accounts. And they may have more trouble getting the games to the post office to ship them, too. It might be better than ebay though since I pay like 10-20% in fees after the ones ebay and Paypal imposes on me.
