I feel like you still don't understand basic economics. It's called supply and demand. There's very little demand for women's basketball in the US, thus there's very little money in women's basketball. Why should we pay people money that doesn't exist? Why not instead look at the root cause, which is why aren't Americans interested in women's basketball? You solve that question and you will magically solve the issue of their pay being lower than the men.
Do you go see movies just to support an actress? Did you go see the female Ghost Busters in theaters? There seems to be a prevailing thought that we need to support different forms of entertainment simply because it has a woman in it, or a POC. I thoroughly enjoyed Black Panther, but I didn't go see it just because it had a largely black cast. I went to see it because I like the genre and it had great actors in it. But if the movie had sucked, and gotten bad reviews, I probably wouldn't have gone to see it. But in your world, I should go see the movie regardless because it's the right thing to do.