I honestly don't understand the interest people have with such ridiculous level numbers. Why do you need to have even 50 levels? Or 40? because there are so many levels, you end up levelling up every 30 minutes or so of game-time. And the difference between a few levels is miniscule.
I personally prefer to feel like I've achieved something when a character levels up. Sure, call me old timer or what ever, but I think the D&D levelling system is pretty good: At level 10 you can take on a small army of peasants by yourself, or a few squads worth of your average city-guards backed by a few more experienced seargeants, without any major damage or problems. At level 20 character is legendary, known far and wide for their exploits (otherwise they never reach that high a level), at level 30 character is able to give an avatar of a major god some big migranes, a level 40 the character is effectively a minor god.
In BG2:Thore of Bhaal, the group arrives at the final bossfight at around levels 40-45. Without giving too much away for those rare people who don't know of it, the party (of maximum of 6 persons) then proceeds to kick the arse of the God of Murder reborn. And the only reason the new god, missing only a fraction of a percent of the power the old god had, lasts for over 5 minutes before getting throughoutly pwned is because s/he summons allies in a constant stream, each strong enough to eat major demons for breakfast. Oh, and she keeps running away to regenerate.
So what I'm getting at is this: Make me work for my levels, make me feel I've achieved something. I don't need 100 levels in infitesimal increaments to my abilities. Rather give me just 10 to 20 levels, with well thought out and noticeable system of improvement to my skills, abilities and stats at each level.