I'm a little confused about what you are asking.
Typically when we are talking about hets we are referring to recessive morphs such has ghost, albinos, piebalds, clowns, etc...
I have occasionally seen yellow bellies listed as het Ivory, but with the co-dominate morphs we tend to name them (pastel, lesser, enchi, etc...)
With any morph (or even a normal) sex, age, weight and quality factor into the price people are asking. A poor pastel female will sell much cheaper than a very nice pastel female. Male pastels sell cheaper than females usually and larger snakes almost always go for more than hatchlings.
If you could give a more specific example of when you have seen a morph labeled as a het for 500 and the same morph not labeled as a het for 200 we might be able to explain why they were labeled and priced as such.
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