You'll find with Ball Pythons that possible hets are mentioned a lot, if not all the time. I don't believe you should charge more for a poss het unless its a high end or new morph, then a lot of breeders charge more for that possibility, but they're just letting you know they might be carrying that gene. I'm friends with loxherp on facebook. I always check out their auctions a couple times a week, but I've never bought from them. They're the reason I got my Champagne Pastel Enchi to make some leopard combos, though! They have some gorgeous snakes. Check Faunaboi and always do google searches on prospective sellers.