I can confirm some members raised concerns that the minimum was too low, because as RRH says, it's easy to spam your way to 25. Someone with mischief in mind could do that easily within a couple hours and then have access to members' photos. The limit is now raised to a higher number.
Addie has split the wife pics threads so those still only require 25 posts to view, because those are a specific fetish and the members who like wife-sharing have so far tended not to post much elsewhere. Needless to say, we're still watchful with those so nobody posts revenge porn or anything illegal.