I have several hats that I would like to list for 6 ref but I keep getting an error that it takes too many slots... I understand I could ask for metal and keys but I'm only interested in metal at this point. No solution?

Wishlist items count towards the inventory limit in the current system (so people cannot sell over their limit). This system will be reworked a bit to be more friendly to sellers but the limit will always be there. In the future we will open up for donation so you can have more space as a donator.