pricing differences: morph, poss het morph, 100% het morph

Ok, this is one I have been wondering about. You produce say a spider. Lets say a spider goes for $250.00. You also produce a spider 100% het pied. These, last time i checked were going anywhere from $1,000.00 to $1,500.00. Now, you also produce a poss het clutch. I want to know everyones opinion on this. Since you cannot say with a certainty who is het and who is not do you sell your poss hets for the same as a non het, do you raise the price due to the fact you are selling the " chance " to produce pied / pied cross offspring? And how do you determine how much to charge for said animal? I'm interested to see how the answers very, or if they very at all.