exp is handicapped, if someone died they loose all their accumulated exp. kher died in the server and now the server's lagging because he went on a huge killing spree and gained forgettons of exp. IMO exp should be something that's counted in a number, not as an object that can be dropped.
Wait, am i right?
Does EXP do anything?
No, its stupid because it serves no purpose.
In one of the upcoming updates, Notch is going to add more benefits to XP. He didn't specify what, but he hinted to perks like mining faster, more uses for tools, and maybe a shop to buy exclusive items.