I tallied up the prices of all the guns i WOULD sell at 50%, after playing since release, and got the number 111,450. To be honest, I blow through that immediately, I'd be forced to buy $15 iTunes cash to get the 40k for the Metal Storm I want, anyway. The server only benefits from a refund system in the long run, as after players get sick of all their weapons, they buy new ones. Eventually dwindling their money supply down, forcing them to buy gralat packs so they can get new guns without selling their already-good ones. It's not an immediate money maker, but more so a long one.