I just posted an answer to a question about first time flyers that was a good start on a real hub. I could've shortened the answer and expanded the rest into a hub, but didn't because 1) I wasn't all that passionate about the topic, and 2) I didn't feel like doing the extra research required to turn my answer into a full-fledged hub.
This in NO way reflects on the hubber who posed the question. As others have said here, sometimes answering the question in "Answers" is all the commenter feels is necessary. ;D