Pk is for fun and money.
I for one, would not want to waste str pots, sharks, risk lots of items for no return.
That's right. I PK only for fun, but of course I hope that I get something in return. If I PK with friends/clan (Rarely I take DMs etc. ) I don't really care about drops, just hope that all my friends are happy. And If I get something I'll be happy, and if not, I won't care.
I don't really PK in P2P, I'm not good at that. So I PK in F2P and I'm always risking full rune (usually with gaunts & berserker). I'm NOT even hoping for over 200K loot... The point is that I'm not a person who likes to pk to earn money. Although I don't want to lose it too much.