I read about 2/3 of the argument for 1 char(some of the post just weren't worth finishing). as those opposed to having only 1 seem to think its bad for traders I'll say this:
I am a full trader. I've had many people over to my place buying armor, weapons, jewelry, potions, and food. at no time has anyone tried to kill me. I've died once and that was from mining a wraith inside my house. most people don't kill traders! if you get mostly tradeskills then an attack skill(thinking its a pk server I don't want to be defenseless) then you're a fighter not a trader and you will be killed, repeatedly!
as a full trader I actually enjoy playing pk servers more than normal servers(as long as there is a 1 char limit) because people don't like going into town to buy things since some people wait at the gates to get kills...so as a trader you can charge a little more to meet them somewhere else. if that player has a second character then they don't need to go to town or to find a trader who is willing to meet up elsewhere since they can make their own crap.
as I'm probably the only true full trader left on fancy lad(weird name by the way Mickey) and your only argument is that its bad for traders, if I'm saying I want a 1 char limit why are others complaining?