For example if you increase your crit by 1% that means the amount of dps all other stats give you per point has gone up by an additional 1%.
So lets say your stat priority looks like this Int>mastry>crit>haste.
Theoretically you would be able to reach a point where you'd have so much Int and mastery that crit would be the best stat to pick up.
I'm just wondering if the stats on gear are such that this kind of a thing isn't an issue worth looking at or if people just didn't bother. If someone knows of somewhere with info on this it would be appreciated.