In my opinion if the females in bikini pictures are related to what they're posting great I.e holiday travelling etc. But if they're just doing it solely for likes then that is another case. It would be nice for a niche market to arrive but I believe steemit bosses (the ones whose upvotes give you the most payout) like the more mainstream posts so as to attract more of an audience. As after all if it is niche it won't attract as many users as they intend and want for it to use. Thanks for the comment :-)