I've posted some topics that were too specialized or didn't catch people's attention for whatever reason - one thread about children in Middle-earth didn't get a single answer for months before someone noticed it; another about the Art nouveau influence in the Elven architecture of the movies got only a few replies and seems to have gotten completely lost at some point in time; and the one about Tolkien and the textile arts has only a few replies as well. I posted a new topic last week that hasn't gotten one answer yet, about the Sil parodies.
It's no shame to try a topic that interests you, but you never know if those who are interested will be around at that time and want to post on it, or have time to do more than just read it without contributing. And it's no shame to have a topic moved, merged or even closed if a moderator considers that best! As long as it's not against the forum rules (which I always assume everyone will
of course have read before starting a new thread!
), go for it - no risk, no gain! And there's always the chance yours could be the hit thread of the month - you won't know unless you try.