Ok, so I am in the planning stages of my mod. Amongst other things, I want to add a merchant that sells blocks. In normal gameplay, even gold blocks lack sell for 0. However, I want this merchant to sell a variety of blocks, even relatively common stuff that should really sell for 0, so I can't just edit the item worth. Is it possible to use the normal merchant framework for this, or would I have to make a custom set-up to allow for this difference in buy price and sell price?