Well it depends on a few things.

Supply and demand is a key factor and in the case of caramel projects this is where it becomes tricky. Supply is low be demand is even lower.
I do not know if you have paid attention to the market in general or the caramel market in particular but over the past several years most breeders have deserted caramels and their combos and the few being sold are basically pet projects.

I personally would not work with caramels or their combos even if I was given some for free and I have a feeling I am not the only one. (ultramels now it would be different)

The second issue when selling not just het but any animal is reputation, if you pop out of nowhere and have no reputation it will me more difficult for you to move hets or double hets, reputation does not always mean that you have 100 of feedbacks and 1000 of sales, it sometimes just mean to have a presence online and be an asset to the community.

I know it does not give you an answer to your question but this is what you are up against.