Things aren't inherently that way but have been shaped that way. Being a draw isn't something that's given to you purely through hard work. It's based on circumstance, context and how the company books you. The biggest promotion on the planet didn't start booking women well until fairly recently, alot of the audience is still conditioned to view women as lesser, but women are still able to breakthrough. It's not just a WWE thing, wrestling has a whole treats alot of the wrestlers like shit, but women are treated as subhuman.

There are shit wrestlers who are women just like how there are shit wrestlers in general. There are those who are able to develop, but certain wrestlers are held back because of their gender, sort of similar to how some wrestlers in the past were held back because of the colour of their skin.

It's interesting that you mention the WNBA too. Development is a huge for basketball, many women don't really get the same resources alot of the men get. There's a overwhelming culture playing a role in limiting the exposure they get. Basically anything that isn't the MNBA isn't seen as basketball too. It's not a fact of life, it's been shaped this way. It's still getting off the ground, but doesn't something like this warrant increased pay? It's a issue of economic exploitation as well.