According to How do unregistered accounts work? over on meta.stackoverflow.com only few sites allow unregistered users to post questions. From the accepted answer:
On Stack Overflow (and a few other sites in the network), you have to log in (i.e. have a "registered" profile) before you can ask questions. Answering doesn't have the same limitation.
Why does AvSE allow those? I'm under the impression that unregistered users often pose "funny" questions. I know my very own questions are not the best or most interesting either, but at least I google first to avoid dupes and then I try to make my question clear.
What annoys me most isn't the lack of that "pre-processing" prior to asking a question but -- to my experience -- the fact that these unregistered users usually
- don't reply to comments,
- don't upvote (my guess), and
- don't accept any given answers (definitely not my guess).
I can think of some reasons for allowing unregistered users to post questions:
- nobody has thought of it and I'm the only one who cares
- it attracts more participants because you don't even have to register to ask why Boeings are pointy-nosed
- it's too few to care about
What are your thoughts?
By the way, according to Mr. Atwood himself, an unregistered account can be turned into a registered account.