This is just MHO, but I thought after about lvl 60 in FFXI, that is when the fun stopped! lol
Most MMOs, at least to me, get very un-fun very quick when you hit the true grind. I am not one to play these games just so I can be elite. I play them to see new things, explore, meet new people, and have fun getting new spells/skills when I level. When you reach upper levels, you have basically seen the whole game, so there is no where to explore any more, you are probably in a static party, or in a high level Link shell (like a guild) since it can be very hard to put together a high level pick-up group, and that is mostly when you meet people. Also, you will not have much more leveling to do, so not many new spells and skills to play with.
That is why I changed games. I'm sure the time will come again with EQ2, but it is very fun for now^^