They have not worked for a direct sale for me. Hard to judge what the long term is, but I did not receive very many views from the treasuries I've been in. Any little bit helps, though!
I love your clay designs. I'm going to try polymer clay making sometime next fall/winter. I figured it'd be a nice hobby to pick up and do indoors when it's cold. Any tips you have will be welcomed. I think you are an inspirational artist.