Don't share information linked to the account, this means IP, email, country of residence.. Make sure your email is secure, also dont use the same email for stuff like facebook,bebo,myspace ect.. they are farms for information.
Dont download .exe files from torrent sites, this includes patchs an updates and anything that ends in .exe , music an movie files are fine an cannot be binded an encrypted with a RAT.
Only go on ventrillo an teamspeak an websites which are trusted, the admins on all of the above can see your IP. And you will be PKing one day in max bank an suddenly your perfect internets will drop out an you will wake up in lumby with an empty bank.
Make sure you have a bank pin... deposit all your expensive items and cash pile before you log out. Its understandable to log out in your slayer gear or something, but if your logged out at GE with your phat set in your invo an you get hacked... well i say tough luck.
Good luck keeping out the scumbags
WOWOW DIDNT READ HE JUST BROUGHT ACCOUNT EDIT !! : ON TOPIC : Mate original IP and first passwords always have the upper hand, at best you will be able to get into a tug-o-war battle recovering the accounts back an forth back an forth, just hope that his not a piece of shit seller.
Make sure you make a RaS about him if he does recover, and he will be banned if sufficient proof is shown