I appreciate that SE guidelines say that you shouldn't put anything like 'Thanks' or 'Hi there' in your questions but where do we draw the line when it comes to edits.
There have been a number of edits today to old necro posts (some of which were closed) and because they now have a newer edit / modified time than legitimate new posts they are being pushed to the top.
Personally I think that if the question is closed and or older than 7 days we shouldn't be editing it for things like grammar or for removal of hi/thanks/bye.