The discussion about more basic questions on Server Fault is currently going on at Perception of purpose . One complaint is about Server Fault being "Developer Support" which it really should not be. It is a place for professional system administrators to answer questions of other system administrators (regardless of level it seems so far). I am guessing that might have been Jeff's reason but I can't say for sure.
As far as people setting up MySQL on Super User they do it all the time. It is used for the backend of things like MythTV etc.
