It's actually really simple. Men's sports take in millions and millions more of revenue than female sports - just the facts. The women's percentage of pay is actually a LOT higher than then men, but the pool from which the money comes from is significantly smaller.

As for non sports; how many women do you see up on the power lines, in the sewers, working on high rise building construction, etc. If women really want equal pay, do the equal job with equal results.