Players use exploit, when they can leave the game during combat. Some use a task manager, another re-connect with dualbox. GM should add protection to NOT allow disconnect/re-log when you are still in combat, untill it end.
I think most of you already encountered random pvp/pk, when aggresor start flee and use for example Bsoe to avoid death.
But now more and more noobs use tactic HIT and Disconnect and it cost them nothing. They can again log in to kill you and disconnect and you cant DO anythink because nobody stop them in their dirty pvp.
Question for you is: do you want pure pvp