Guys can anyone tell me what do pkers gain by pking

That lol joker (warrior) pked me 5 times for no reason.

my armor in the kill.
well iam looking forward to face him in arena when i IvI up

Guys plz tell me more about those pkers

pked & i do hate to pk others.
I would like to get more info on pkers.Plz pm me .......iam Mrcls(mage)