I remember, in Lineage 1, going from level 59 to 60 needed as much xp as going from level 1 to 59. It is definitely a grind at high level.
I guess, in WoW, it's easy to get to 60 and then you grind raids to increase items and keep you interested.
In the Korean MMORPG, they make you grind all the way to high levels and then like in Lineage and Archlord, make you do guild PvP to control a castle and in the case of Archlord, becoming the Archlord for a month and control the weather and be uber. Those games also normally have harsh death penalties with xp losses and possible items loss (looted by Killer) especially if you are a PK yourself.
Will give it a go and see ... (thanks to Sharez