One thing we need to remember are some posters are new to this board, and are unfamiliar with the history of some topics. While those of us who spend a lot of time here, and have for years might roll our eyes when a newer poster asks a question that's been covered ad nauseum in the past, we have to remember that not everyone has been privvy to those conversations. We were all new to this board at one point or another.
And yes, newer posters should look around and search some older posts, but you can't expect them to have read the whole database. They should feel free to ask the questions they have.