It would be worth quite a bit, but it would have to be comparable to either rogaine or hair transplant surgery. Hairline surgery isn't worth the money for most men, but they wouldn't even blink paying that much for cancer treatment. If it were comparable to rogaine in price it wouldn't be as much of a cash cow since they're making less per sale and maybe making fewer sales because it cures the problem. And if I remember correctly, we only have finasteride/minoxidil for hair loss because they were originally used for high blood pressure
I am bald, not totally but enough to shave my head. I would love to have simple solution for this problem. And I would pay gladly a lot of money if this would be a one time thing. Or let's say every coule of years. But I have seen friend having his hair transplanted, it is not much hair in one sitting. And after one year of growing that hair, for me it is like meh, I wouldn't bother. He does not take pills as far as I know. To have a good enough hair, you need to have couple of very unpleasant transplantations and take pills with side effects for a long time(maybe for ever).
For me it is not worth the hustle at all. So while I passively lurk for better treatment I shave my head 2 times a week and don't waste energy on thinking what if. I know some people have big mental problems considering hairloss. I am glad I can grow a beard and I am tall, so it does not make me look bad. It is just a different look. There is a lot of baldness acceptance videos going on during this pandemic, for example bald caffe on youtube. I think it can help a lot of people deal with issues. So, not a problem of money but it is a hustle to get it done right.
The few I've read don't hint at much money being thrown at the problem. Books often start by "we know very few about hairs".. not "we have all the data anyone would ever want but the problem is really hard to solve".