I'd consider entering twice (once for me, then once more for my girlfriend) but she's not that into CCs so I didn't enter for her. But to go out of your way to cheat the system AND sell it for a profit??
Not sure what measures they take but wouldn't you be able to stop a paypal address to be stopped from being used in multiple entries?
The IP thing is a good idea, but I use satellite internet, which sometimes says I'm in a separate state. I mean, that's not the case for most people so not a problem
On another note, if anyone has a drunken skull or something in MX they'd trade for the topre one I got from this sale, let me know. I sadly don't have a topre keyboard like I thought I'd be getting due to limited funds.