Price per bean has zero to do with anything. Capitalism rocks.
If you can shill crappy beans for that price, you'll make a quick dollar but this is a reputation business. You're probably done after that. I forget the strain name but Berner and cookie fam took it in the ass after a pre-sale of beans at an exorbitant price failed to germinate. There are reasons why some things are 'clone only' and a lot of it is because a jackass like you or me finds absolute fire in a random pack of beans or hermie bagseed. No fucking way we could reproduce it but cloning it is fucking simple. As it happens, breeding it is NOT that simple.
If you have consistent fire it's whatever the market will bear. If I pay $10 for a bean - hell, call it $20 because maybe they're regs and I'll only get about half girls. If the plant germinates and is a girl I can get a few ounces out of it without even trying or spending much time on it. Pack paid for - the rest is gravy IF the weed is good. Then it's back to the capitalism part. I have bought seed packs from a breeder just because a freebie of theirs came with a pack I bought of someone else's gear.
Also, $10 for a bean that can be bred, cloned, cash cropped etc. is really nothing IF the genetics are there and the work went into making the strain presentable. If you spend $10 on a tomato seed you will never see much return on that investment compared to cannabis. Unless you have a farmers market stand, then that's a great investment too!