I think there are various rules about when a user gains and when he/she doesn't gain reputation for edits.
One of them is when he/she has already gained 1000 rep from suggested edits, another when he/she improves the edit during reviewing.
But I think there must be more rules because I have ceased to gain any reputation from edits, probably since I crossed 2000 rep.
So is there a rule that 2000+ reputed users may not gain rep from edits, maybe because the edits are not reviewed?
BTW if there is such a rule, I think it is good. If it is a bug, make it a rule or fix it.
I am adding three tags because I don't know which one of them I'm really asking for ;P