The poison one can go through a washing state or if you tend for magical/fantasy thing a machine that can transform the potato, change its DNA, or something like that. Golden can be a potato that can't be peeling with standard tool but can be sold with half price. An eaten potato (like by worms), can be peeled but if sold, you gain a penalty or 0 of price. You need to remove the worms. I think it do not need a lot of machines because it will be too much. Just other minigame with tool to buy. Instead of just peeling, you can wash, get the insects off, and other things with your ideas! I don't know if it's fun or cool idea. I just think the idea of "other thing" that can comes sound fun to me!
Oh yes I see. It's just frustrating too see those objects on the market but can't test them. It's doesn't change the quality of the game thought.