If you simply don't like watching a sport, it probably won't matter if it's women's or men's. I don't really watch baseball or softball. I also don't watch soccer because it's boring. Same with hockey.
There's a reason that college football and NFL football are both very popular - because they look the same to the person watching them. The offenses look generally the same. The defenses look generally the same. The athleticism and overall product looks generally the same, right?
The same is true for men's college basketball and the NBA.
The same is not true for the NBA vs WNBA. The products do not look the same. There is an obvious lack of speed and athleticism in a WNBA game. Women, even at the highest level of their sport, can't do things that high school boys can do.
That's why people don't, and likely never will, watch WNBA in large numbers.