The issue with this system - somthing I've been thinking about for months - is that theres no punishment for registering multiple accounts. I've come to the conculsion that there are 3 options here:
1: Charge a small ammount (say $1) for the account - that wouldn't be selling MTA, just the ability to play on "secure" servers
2: Take a long time to activate the account (say 2 days), to slow the whole process down, afterall, time is money.
3: Moderate it carefully and cross check each registration (i.e. have they used the email before, check the IPs used etc)
#1 is clearly the best, I'm not sure if people would be willing to pay the $1 to be able to play MTA in a cheat free enviroment. Clearly, if you cheated, you'd have to buy another $1 account - could get costly for cheaters.
I'm not suggesting we're going to do any of these things, but it'd be interesting to see what people think.
eAi