The statement you made still does not make sense.

If something is not in demand, then it won't sell quickly.

If it's not in demand, then it will sell eventually, but it needs that one person who actually wants it.

So if your selling something at a very low price and it's still not selling, then it's usually because nobody wants it.  The way some of you talk, it's like Ebay hides your listings, which is utter rubbish.
They may get lost in the sheer volume of listings, but they are not hidden, unless you are below standard or there is an issue.

I have some of my clothing items listed here and on V somewhat cheaper, but they don't sell over there either.  Is that because the listings are hidden or just because nobody wants them?