Since its mostly men on here, I am thinking it might take some sort of embarrassing forfeit.
Maybe:
Zoomed in very close up photos of their private parts
Collage photo of face with private parts front and rear
Profile name gets changes to real name (first, last)
Person with the most votes can never have their photos removed. They are permanent!
idk…. or a combination of above but would not want to scare off the participants either or they may drop out.
Something that would cause a man to want another man to have to go through an embarrassing forfeit so they spend money to vote for them so they have no choice!