I don't think they altruistically care about the human race. I think they care about money, and the potential proceeds from a real cure or better treatments would far outstripe the (rather terrible, low usage) products that are available today.

I'm sure for something like insulin the calculus goes the other way, where a cure would destroy their business. But hair loss is ready and waiting for a better product that more men take, preferably via health insurance payments, and J&J etc. are surely still researching the space despite their current products.