Buying Hets or Possible Hets is only of any value at all if you intend to breed the animals in the future. Without a plan to breed it is just a waste of money.
That said, is there any value in buying Hets.......Hell Yes, (Thats my attempt at being polite). Hets will cost you around half the price of animals with whatever visual trait you are buying for. 100% hets come with the guarantee that when you breed them, (if successful), you are guaranteed to breed animals with the visual trait you are trying to achieve.
Possible hets (50 or 66%) chance, I'm sorry Pinefamily but I have to dissagree with you on this one. Possible hets can normally be sourced for a fraction above the price of wild type animals. If you buy enough offspring from the same clutch you will be almost guaranteed success though it might take a couple of breeding seasons to get the combination needed to get you the desired outcome. Lets think about something rare such as an Albino BHP. If I had enough possible hets would there be value? Of course.
If all we have to start with is a single Albino animal then to develop the line there would be out crossing that would lead to a line of 66% or 50% hets.
That said when I have purchased possible hets I have bought them for the look of the animal not for its potential/het status. If they do turn out to be het that for me is a bonus.
Is there risk with buying hets. Of course there is, you can't see what you are buying, you rely upon the integrity of the seller to sell you a gene package that you are paying for. That said, buy from a reputable BREEDER. (Only the breeder of the hets knows exactly what animals produced the offspring). There are more good/honest people in the hobby than bad ones and I have never been ripped off with a het that turned out to be a dud but I do know people that have been and sometimes for seriously expensive animals.