Mmm....I kind of get what arsenal is saying. Women ARE less interested in sport than men, in general, and audiences for sport, whether live or on the box, are overwhelmingly male, for most sports at least, and most definitely the high income sports such as soccer. Even then, not all soccer players are well-paid; payments are made according to the entertainment value given.
Sports such as women's football and rugby, whilst not attracting as many people to watch, are at least growing and are more visible, which has to be a good thing. If nothing else, at least these female players will provide excellent role models.
Tennis, I think, is more complex. I'd say the audience is mixed, but perhaps more female. Even so, male players seem to be more popular and thus command more in terms of sponsorship, airtime etc. But I think that's changing, too, slowly. It's not a level playing field, so to speak.