None of this works as proof of your argument or my question.I don't think I need to prove that to you. You said it yourself, that it's the reality of business.
I'll give my favorite example though: Annie Oakley. Oakley is famously portrayed in the musical Annie Get Your Gun. In the musical, she's a great sharpshooter who falls for another sharpshooter, Frank Butler, who isn't immediately interested. Over time, he falls for her but repeatedly runs from her because she's more talented than he is and his ego can't bare it. Ultimately, they end up together only when she deliberately loses a shootoff with him so that he can have his girl and be the star of the show.
In reality, Frank Butler was a sharpshooter who lost to a younger and more talented Oakley the first time they met, he fell for her, got her to join the travelling show he was in, they got married, he gladly acted as her sidekick, and after she died he didn't know what to do without her so he just stopped eating and died himself.
The musical centers around the line "you can't get a man with a gun", because the theme is that guys want dainty and untalented women. In reality, Annie Oakley got not just a man with a gun, but her entire life and career too, with people to this day questioning how she could be so accurate with the technology of the time.
So like, there are a few reasons I love the example. 1) There's zero question of whether the message of the musical is sexist. "Women can be more talented than men, but they shouldn't" is not a theme any reasonable person can say isn't sexist. You can't get lost in questions about the real differences between men and women in there, Annie Oakley in the musical is more talented than Frank Butler, and for the sake of their love has to pretend not to be. 2) The contrast with reality is so blatant, entertainment really is worse to women than reality. In real life, Oakley was famous and celebrated, and then they made a musical about her and did her dirty. 3) That musical was conceived of by a woman, written about a woman, and presumably targeted at an audience of women. There's no argument that Annie Get Your Gun was made to fulfill male fantasies. Put it all together, the fiction is full of sexism, far more than reality, because for some reason that's the fantasy both sexes want to watch.
You said that people do discriminate between male and female performers, both in the industries and the audience.
What proof do you have that audiences are not going to see plays, films, or tv shows specifically because they are sexist. I didn't ask for you to showcase that proof in a fictional work, although that was your only option because your opinion on this matter is fictional.
There is no proof that people didn't go see the all-girl Ghostbusters because they were sexist. And if you can find a source in which the movie-going public said they weren't interested in a bunch of chicks staring in a movie, then cite your source. Because if you can I will delete my account on this website. If you can find any public survey or official report that proves sexism is why that movie or any all female film failed.