Last night I provided this answer and had a conversation (of sorts) with Pat about my lack of attribution (feel free to check out the original answer, which isn't substantially different other than the lack of link and that I'd gotten some inconsequential details incorrect). I'd originally gotten downvoted for that, with the suggestion that I find the link again.
I don't think this is a big deal, but it did make me wonder...is it worth potentially reducing the number of answers by discouraging items that aren't cited on this particular site? In my case, my information came from an article written by Eric Martin. I don't know him personally, but I do know that we used to attend the same smallish convention a few years back. If I'd gotten the info from a face-to-face conversation, I wouldn't be able to cite it, but my answer wouldn't have changed significantly. Would that still be an inappropriate answer (even if it's true)?
I certainly understand the point of view of requiring attribution for things; we certainly don't want this to become Yahoo Answers. I especially think it's necessary on the more hard science areas of SE, or for things like rules questions where there needs to be a single, unambiguous answer. However, for questions like this one, I'm wondering if we'd be better off with unsourced answers than things that could be left unposted due to them being unattributable. Thoughts?