Being an EX dating site user (I met my wife online) - I wouldn't really mind a shot with a higher end camera- one it would show that they MAY understand abit about photography which would be a plus
Alot of people have quite apalling shots taken via web cam or selfies taken at arm length that just doesn't really do anyone justice.
A nice photo tells me that the person has self confidence in what they look like and helps communicate if I find the person physically attractive or not.
I agree that some studio shot with fully made up is abit pointless as what happens when I meet them in person? Going to be abit hard to hide that quizzical , is that him/her look :P So for both Sexes I echo the original guidelines the dating places have but using an SLR is fair game.
BTW does that mean a MILC is ok to use as no mirror! ;p