I have bought memberships to paysites a good number of times, and I have a couple that I've joined for a month or two every year for several years running.  I would probably buy a lot more porn if *MY* site was making a profit! 
 
My husband, while he has a HUGE collection of naughty pics harvested from usenet over the years, has never once bought a site membership.  Not even when I offered to get him one for Valentine's day.
Of course, I am totally non-stereotypical in my purchases:  I go for hentai and extreme bdsm art sites mostly.  Stuff which is perhaps not so easy to find for free.  He goes for skinny waifs in panties, which are a dime a dozen.
I've not had any women members yet, but I had several lady fans when I was doing CamZ shows.  They often spoke of loving my honesty, openness, and genuine orgasms.  I've thought about marketing my site toward women, but I kinda feel I wouldn't know how to go about it - I've been off the pussy market for a decade and don't really feel like I know how to chat up a non-male person anymore. 

  My content is mostly me cumming in various ways, so there's a definite focus on female pleasure, and while my stunt-cock (hubby) isn't really beefcake material the genuine enthusiasm & affection of our couples scenes might, I think, appeal to a lot of women.  It turns me on to watch our stuff anyway.
 
If I weren't so afraid of the Jesus-police I would LOVE to start a rape fantasy site for/by women.  I know it's a hugely common fantasy for women, and I think it would be super to have a "safe" place where women could enjoy that fantasy without feeling 
truly denigrated.