This has bothered me as well. I've posted several fills myself, but I'm busy and I write fairly slow, so it takes me a while to get a story to a state I view as postable. Add to that a propensity for writing longer fics, and it takes me a while. These sorts of comments make writing stressful rather than fun, and seem to dismiss all the stories I've already posted. Needless to say, I am not pleased by these implications.