I think quality as in using the right word, proper spelling etc. as well as a story that has well defined characters and a tension filled plot are all very important. If an author has a book full of mistakes or a plot that should be solvable in 5 minutes or characters that seem not to differ from one another (so that you can't tell who is who) then it won't matter how many books/article/short stories they write. People will catch on that their work has such flaws and stop buying. Incidentally the discussion of writing topics should actually be in the writing forum. That way it will get the most exposure.
