In the case of soccer, the PROJECTED revenues of the women’s team are higher. But historically the men’s teams have earned more revenue.
Additionally, the ownership structure, and hence the compensation structure, of the men’s and women’s teams are different. The women’s league is owned by the soccer federation, which pays the women’s salaries.
The men are paid by their club and the federation pays for caps and other appearances.
IOW, the men and the women aren’t working for the same organization.