But even if it's "possible" why would someone pay extra money for it? You could be paying 150$ more bucks for something that isn't what you're hoping for
Because you could ALSO be paying like 10% of what you would normally pay for a full-on het. People prove out possibles all the time. Its very lucrative.
As for being dumb for buying one? Man, you know nothing of the market. Having a male 100% het and 3-5 female possible hets will usually yield full on homozygous morph babies. Its nuts. and for like 1/3 the cost of just buying a pair of hets! Serious breeders do it all the time. Tell them that they are dumb when they are making $80K a year off of possible hets. I dare you.