[Drakus4]

or you could limit it so that only 1 account per IP adress could be made rather than 1 per e-mail...if anybody has gmail they could simply send them selves as many invites as they want, and create a trial account. If you set it to an ip then it would be much more difficult for them to make multiple accounts, this would cut down on all the people who have payed and make an account for harrasmentm, to cheat/hack on, or to use as a guinua pig for kills. bounty, spar rating, money, and other such things.