Why do female models earn so much more than male models?

Why do it looks like it?
At the lest times media abounds stories of earnings witch is based on gender.
But there are some reason, i think that nobody seams to be upset about this fact.

I have to noted that female models have to do much more work, than male models, f.ex. they have to wear more, sit in a hair and makeup chair for hours. With man it's less to do, it's less work.





In my opinion, this type of work is just one of the industry where women earn more than men. No one seems to cry out about the injustice.