That's possible, though I haven't seemed to have reached this cap yet. And, while I may be COMPLETELY wrong on this (if someone could tell me that'd be great), but from what little attention I've paid, my crit chance seems to go down a little every time I level, implying that you may need more agility per crit the higher you are? I have no idea. I'm just pulling that out of my ass. Although, that would make sense to me.