Because the premise is wrong, there isn’t actually that much commercial incentives and there is also economic competition with other treatments.
Assuming someone finds a cure for male pattern baldness with no significant side effects, it has an issue that men are usually not willingly to tint their hair that frequently, and by age 30 most men have some gray hair and by age 40 most men have significant gray hair. Coincidentally, many cases of male pattern baldness algo get worse close to this age.
The cure or definitive treatment for male pattern baldness need to compete with existing treatment with topical finasteride, wigs and hair implants, while also having the monetary and time cost of tinting hair. Most men think it is cheaper and more effective to just shave the head.
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