What's the disparity? Two separate leagues, so it would be expected that they have two compensation models. The unpleasant truth for the WNBA is that it has fairly low market value in the grand scheme of professional sports and has a niche following. There would be no WNBA if not for the fact that the NBA is willing to lose money each year that the WNBA is on their P&L. That's not exactly a secret, so for the players to then complain that they aren't being paid their fair share is just complete delusion on their part.
While viewership has improved, it's still paltry. Less than professional bowling and other sports shown "ESPN The Ocho". And there's probably a fairly low ceiling. Women's basketball is just not that popular. College is an anomaly because of the association with schools, but how many of those school fans follow their graduates to the WNBA? Probably not a lot...even UConn as evidenced by posts in the main board.
I will give you that this generation of WNBA players is more media and business savvy...but for their own personal benefit. Frankly, they don't give back enough to the WNBA to help grow the sport, and that's a crying shame. You get all the complaining about the salaries, and some really disrespectful stuff from players like Cambage saying it's "not worth my time" and even veterans like Taurasi who take a check to skip the summer play so she can be rested for her Russian team season. If the players don't care about the league, why should the fans? I've supported the league since inception, but the attitudes and entitlement of the current players has been a huge turn-off for me. I doubt I'll be a regular follower once Candace Parker retires, if I'm being honest...unless the players get a reality check and realize how lucky they are to even have an opportunity to play in the USA.