That's a better incentive than anything. MapleStory added PvP to the game recently, but if it didn't award a decent amount of EXP, I doubt if anyone would have made use of it. There are some good items to get from it, though people in that game are among the laziest I've ever seen

I don't want to hear anyone complaining about Pvp when it's in a closed environment and it won't hurt anyone that's not participating.