Probably not, but people have only ever bought en masse for big draws, and the female fighters, overall, have been a net positive for profits (partly because they're even easier to give shit money to, but that's another discussion). Any argument against WMMA on UFC cards can't really include profit margins as they simply fall flat. I don't care for WMMA, but then again I selectively watch the fights I care about, anyway (a majority of fights under the UFC banner fall are in that criteria), so it's not really a big deal.