To me, it seems that if a breeder is charging a high amount of money for a snake(multiple hundreds), there *should* be a reason for it. That reason is almost always genetic history, in terms of definite hets. and phenotypes. As far as possible hets goes, I can't see charging extra for them, nor can I justify
paying extra for them. In my mind, it only makes sense to provide as much
proven info as possible when charging high dollars for a snake.
For example, as a beginning breeder, hets are very important to my purchase decisions. However, possible hets are a "luck of the draw" situation. If I want to breed Amber Motley Diffused(or whatever the trade name would be

), I would certainly pay more for an Amber het motley het diffused than an amber. I would
expect to pay more for such a combination of definite hets, as well. If the breeder can't list them, I can't be expected to pay for them.
On the flip side of that coin, I think it would be beyond greedy for a breeder to expect someone to pay more money for an amber poss. het motley and diffused. IMO, that should simply be sold at the going amber rate. I don't think it is fair nor justifiable to charge for possible hets., but it would be nice if that info could be provided.
While it would be impossible to list every single possible het a snake may possess(what about the possible hets from the breeding stock?), a breeder that keeps good records *should* be able to supply a reasonable amount of information. Afterall...you, as a breeder, *should* know who the parents are for each clutch you produce, which leads to a reasonable conclusion of being able to know what definite and possible hets each clutch-mate contains, based solely on the parentage.
But my tune may change when I'm dealing with 1,000+ babies every spring...I don't know from that standpoint...