I agree with @rhutcherson77. Prices between breeders, or from a breeder directly to a pet owner, are typically lower than the prices in a brick and mortar store. You may be able to ask those prices on location because a lot of people walk in to a pet shop without knowing what else is out there, but on MorphMarket you’re competing directly with people who don’t have the overhead of running a store. Because we don’t have those costs, we can keep our prices lower.
Try and see it from a buyer’s perspective. If you had the option of buying a kingpin for $400 and one for $200, provided they were both equally good looking, which would you pick?
I’m a hobbyist breeder and I sell about half of my snakes on MorphMarket, with the rest split between Cragislist, FaunaClassifieds, and Facebook. MorphMarket reaches the most people hands down, but you really should browse around and see what you’re competing with. Don’t price yourself out of the market.