I just thought, that it might be useful to have a feature so that the asker could somehow indicate his/her level of skill in the area. So that people could easier filter questions if, say, they don't want to see beginners' questions. Just a thought.
I wonder how many people on StackOverflow could accurately gauge their own level of expertise. Especially those asking a lot of questions. A few years ago I was interviewing people for a junior SQL Server DBA position and I had people saying they were 4/10 when they were a 9, 9/10 when they were a 2, and everything in between. I told one person who said they were 8/10 to take SQL Server off their resume. Literally.
I think it would be very hard to come up with some scale that would be applied consistently enough to be meaningful. As an answerer, it should be easy enough for you to look at a question and decide whether or not you want to answer it, regardless of what skill level the OP thinks they are.