@ebrown p,
That's
one thing. (And something that is very much an industry for women, too, if a quieter one. Men have a choice to be bald or not, and so marketing is needed. When women suffer hair loss -- and women suffer hair loss -- they do not really have the same choice, so are more likely to go ahead and find the solution [and pay mucho moolah for it] without any prodding.)
And something else that has changed significantly in my lifetime. When I was a kid, hair plugs were for the occasional highly-paid actor or maybe a CEO. Now my neighbor gets them and doesn't seem to think it's that big of a deal. Hey, he can afford it.
Anyway, again, I'm talking scale. There is definitely stuff marketed to men... and way more marketed to women. Various beauty industry elements are cottoning to the money that can be made off of men and are doing something about it. But it's still not at the same level.