solipcoder

As others have said, my guess is the driver. Check this out https://help.ubuntu.com/community/BinaryDriverHowto/Nvidia

Allthough wouldn't your name and address be tied to the cards anyway(Last time i checked my billing address is tied to all my physical and virtual creditcards), so it should still be possible to tie the purchases to the individual.

Yeah, that's true.

However, I think you need to give up on limiting number of accounts. What's to stop me from having my relatives or friends buying me additional accounts?

If you design the game where having multiple accounts gives the player a major advantage, the players that actually manage to get multiple accounts (and they will!) will certainly break the integrity.

With my bank, I have the option to generate as many temporary credit cards as I wish, so your solution would not work.

 

Wow really? Why would they allow that?

 

OK, back to the drawing board to figure out a way to do this in game. 

For secure online purchases. A lot of people are reluctant to give their credit card number to certain websites, so they allow you to make a temporary credit card for each purchase basically.

With my bank, I have the option to generate as many temporary credit cards as I wish, so your solution would not work.

I think you should think of some in-game solution, such as not allowing new players to trade for x amount of days, or limit how much they can trade.