I know it's "accepted" in the mmorpg world to allow account selling, and often alot of money is made.
But these kinds of activities attract the beter kind "hackers" too. It's been happening (not really the kind of gaming genre related to this site) with online poker already, where bots make money.
It's just a fact that where money can be made, people will find away to cheat out of it, and mostly those people aren't the CS like script kiddies from 14 year old