Anyone who is investing money in ball pythons or any other type of investment needs to do their homework and understand what all the terms mean.
50% or 66% isn't just some random number that people throw on possible hets, it's an accurate representation of the chances that animal had of inheriting a copy of the gene from one of the parents.
50% means that the resulting offspring were from a 100% het to a normal, and 66% means that the resulting offspring were from a 100% het to a 100% het.
Yes, there ARE scammers who take advantage of the face that hets (even 100%) look like normals in most cases (although there are some hets that seem to have markers that folks look for on the possible hets to help determine which ones they think are more likely to prove out).
I believe Heather (LadyOhh) just recently proved out some 50% possible het pieds this year. Possible hets are usually sold for normal or slightly higher than normal prices, and anyone who purchases possible hets should go into the purchase with no expectations of the results down the road.
There can be disappointments and there can also be great celebration. That's why a lot of people will choose to buy the entire clutch of possible hets. Heck, I'm raising up my 50% possible het clown females I produced - every one of them. If some don't prove out - what am I out? I have a beautiful, breedable weight normal - where's the downside in that?