The security of kBot's database is quite good. The servers are using the latest security methods and the data between kBot-><-Server is encrypted(it should be, i don't know, i never checked this thing). Even if a small hacker(here we can talk about hacking) had acces to the database is a change of 0,01% that the guy hacked is you
A more interested target are Ibot users because it costs more moneys, and that guys 100% spent some moneys in the game. After they have the username and pass of the game they(the hackers) can check at Uridium page to see infos about credit cards and other things. This should be the main reason to work hard for having that accounts in your hands. Enjoy!