I love this suggestion
I have an absurd amount of common cloth and thread I keep picking up through strong approaching and I haven't needed it for weeks so it just keeps piling. I'd sell it but it's only worth 10coins compared to the 13 coupons they cost, so it's really not even worth it.

Originally I thought maybe some sort of trading system between players would be nice but I could definitely see why they wouldn't want that (wanting people to actually play themselves and buy things of course, but the annoying beggars seen in other mmos that have a trading system oh god no.)

A system to let you use these things so they don't go to waste would be great