As per this answers making tiny edits is not encouraged. Specifically edits that just make a single letter change or just remove salutations and thank yous. I buy it - as this may just tip an answer to be a community wiki, or even worse be used as a way to game the system for few reps.
As a reviewer, I feel uncomfortable approving such edits and even more uncomfortable rejecting them when the rejected edits are approved any ways. I think the reason why such minor edits are eventually approved is that not a lot of 'reviewer' (and editors) are aware of drawbacks of allowing such minor edits.
As a starter I would recommend linking to Jeff's answer in the 'minor edit' section of Reject dialog and potentially by alerting 'approver' when system detects a minor edit is being approved. Thoughts?
Examples? Here are few edits that I believe should have been rejected. Please note - I don't intent to single out this user. It's just an example I came across that demonstrates this issue.