It seems to me that listing "regular" stuff shows the generosity of the seller. These are items that the seller expected to sell for a profit.
What are we supposed to offer?
The odd things that don't fit into our categories? Once all of those are gone, where will new items come from? I know many people offer handmade items, but not everyone has time to do that, and I for one, have absolutely no talent.
I've been lax lately in participating in the YDC (too many things that I absolutely have to get done first). When I do participate, I convert some of my existing listings. If people object to that, I guess I'd better not start listing in the YDC again, because that's all I have to offer.