They are worth what people are willing to pay for them. Price them accordingly. I usually check Kingsnake.com's classifieds to see what others are pricing their morph to help determine what I should price mine at. From my experience, the less reputation you have, the less you need to price your animals. Why would someone buy from someone with little reputation for the same price as someone with good reputation? However, they are more likely to buy from someone with little reputation if they are getting a good deal. Once you build your reputation, you can start pricing your animals higher.