What's funny? Your exp is high rates and your loot is low rates. Think how that will turn out ingame, maybe 10x is too high - 5x or something, but you'll end up with level 100's that can't afford to fight...
You'll also put off new people. People don't wanna see level 120's / 150's running around on a 7.4 server :S
5x is low enough. as i said its better to not touch stages now
though highest lvl is always main target for people, getting a lvl 120 is gonna be pretty hard and i would say 150 like imposible