Do you think there's the danger that, if people see a question's already been answered before entering (or after, it doesn't matter) they don't want to answer anymore (with first cause of action being that of not overly reading the answer)?
For some Jellies yes, but not in my case. There is often another perspective, or a nuance that can be added, to give a more helpful answer, or to dispute an answer that is not factual.