Sounds like a crazy statement but I'll vouch for that (more or less.. you obviously don't gain a constant xp while leveling up and it takes a while to get to hell, etc... but if you look at my record I replaced Pons pretty quick then hit a big wall with Cosmos shortly after).
Not that I think the the xp curve is so unreasonable on the top end. Its more about achievement at this point and staggering the leaderboard. A bunch of 99s up top would be kinda ugly... happy that it will be a tiny % of folks up on top. When I was first starting I thought I'd hit 99 in a couple days. Boy was I humbled.
For us, we're fighting for season first 99s and that will be recorded as a nice achievement, but for others... I've been mulling over some ideas for rewarding accounts with lv 99 chars... will have some suggestions soon. Maybe a removal of race/class restrictions so those guys can be any combo they want? Might be cool but just an idea.