I'm at a measly 3500. Haven't completed all achievements for a single game yet, probably never will.
It's funny, these points mean pretty much nothing, aside from bragging rights, and yet they're so addicting. I keep checking my friends' scores and what achievements they've accomplished just to make sure I'm ahead of them or as a way to catch up.
So silly yet genius on M$'s part.
Wii games(aside from MP3) should definitely incorporate something similar to keep people coming back.