pK's will have to level like normal characters. A pK will allow for a middle ground between normal players and admins that makes a character legit, yet be able to take care of server community affairs.
There won't be a lot of admins on the PCRPG4 server, when it's ready to be released. The majority of authority figures will be pK's, which have to play like a normal character. They aren't given any powers that can corrupt or artificially help their character in any way. Unless you want to fine yourself (negative fines don't add coins, btw), kick yourself, ban yourself, etc... you aren't going to be doing anything to your own character.
That's the beauty!