That 600K has built up since the account was locked, which usually prevents people from withdrawing money from their PayPal accounts. Sixty thousand orders for a popular game in that timeframe - especially one that's popular on SA and the various chans, and is plugged by TF2's and Rock Paper Shotguns' websites - is entirely reasonable. Hell, Dwarf Fortress pulled together tens of thousands of dollars in a couple of days back in April through a mere tip jar and with vastly less exposure.
It's probably easier for people to say "I'm too lazy to look into the game in question about which I know little or nothing, so I'll just decide he's doing something illegal," though.