The merching shit is the whole reason why they're so expensive anyway. It's actually pretty interesting from an economics perspective to see what happened - you'd get phats from crackers, right, but when people were popping crackers all they'd want is the item (one players gets a random item and the other gets the phat). Phats were fucking everywhere in 2001. People didn't want them. People actually chose to sell them at the general store for 1gp instead of keeping them. They were a trash item.
All it took was for a handful of people to start hoarding them, and low-and-behold in 2003 they fucking shot up in price once the demand was there. There are some idle accounts that still probably have like 500 phats sitting in the bank. If any of those players becomes active in the black market, may god have mercy on RS's economy lmfao.