You're setting your prices higher than that of, say, Gamestop. I checked a couple of your titles and they sell at Gamestop for $15 (others might be different, they were just the ones I checked). You're asking $17-$24 for them, depending on the BTC value of the moment, and that's with no escrow. As a new user, no one trusts you. Therefore, escrow prices are even worse, ranging in the $22-$30 range (once again, depending on spot price of BTC). Not too many people are going to want to pay a serious premium like that, and most people have a Gamestop near them.
I just saw on your bitmit site that it was .6 + 1 S&H. Maybe if you offered combined shipping? $12 shipping is pretty damned steep for a single game. It probably wouldn't cost you that much to ship all of them if they were going to the same place.
Just some advice. Feel free to ignore it.