speaking from some experience on these sites POF, Lava Life etc, yes its full of gals who are very high on themselves and expect a guy who looks like Clooney or Pitt to contact them and has about the same type of income!! but on the flip side many have menial jobs, live in a 500sq ft apartment in suburbia, a lot of have very little education or any sort of skills training, are pushing 40, angry, alone and wondering why and yes to top it off many are not physically attractive and think going out to a club in track pants is ok.
Can one have sexual relationships with a lot of women on these sites, of course definitely, but what type women are you dealing with? well see description above.
As for the whiny guys who are boo hoo I am 5'6 and never get any chicks!!! well time to focus on what ya got, not what ya dont have!!! so what start looking for gals that are 5'2, there are tons of them!!! the key is the attitude, most women just want a guy who pushes their buttons correctly and the way to do that, well try confidence, be funny and cocky (emphasizing the funny part nobody likes a jackass) get a better wardrobe, work on the sense of humour, start working out, talk about your interesting job, ask her questions, women love to talk about themselves ad naseaum!!! I dont get these guys who hand women all this power to judge and control them, you get into a car everyday and fly down the 401 at 120/km an hour without giving it a second thought, why give that much power to a woman ya barely even know, relax, play it cool and the gals will be there.