That would be problematic because there are items that generate unlimited amount of other items.
An idea about buttons
What if we could sell stuff in our workshop for buttons back?
Hey, feathered friends. I'm Chief RedFeather, and I have an idea about buttons. So far, the only way to get them is to review other's sets, play Cosmic Journey, play 15 Puzzle, or pick from a potted button pom. So, I thought, what if you could sell items in your workshop to Scunkie and get half the buttons back? For example, since spray paint costs 5 buttons, selling it will give you 3 buttons back. Or, if you sell a black flashlight, you would get 25 buttons, since it costs 50 normally. This is just a small little suggestion, but I think it would be kind of interesting.