I don't agree that arena is for people who suck at PK. There's lot of pk'ers who arnea. But maybe people who are wusses don't pk. And your definition of a wuss is.....being afraid to lose everything?
The arena seems twofold. It is an event where people can show who is better at fighting in a totally controlled, premediated and artificial environment. And it is a way to test out new skills against others.
PK, is more of the hunt and the survival and the unknown and being prepared for anything. In a way PK is easier because the anticipation just before you know you have to go into the arena is nerve racking.
I've never tried PK but I would like to, mostly so I can get my frustrations out if I get pissed off. Like for example....in the unlikely event that I would ever be pissed at you, even if I would lose I would get some satisfaction in hunting you down and attacking you.
Your mind seems made up, but maybe sometime in the future think about two levels of pk. You talk about wanting the game to be more indepth, and this could achieve that for us wusses.