Having skimmed enough local profiles, I'd be hard pressed to find any evidence that only 5% of ladies are real. Most of the profiles look pretty authentic to me (OKCupid) but I guess if you're using other places, they might not be.
My observation is that I just don't mesh with a lot of the folks on the site. Could be for a number of reasons: lots of vegans/vegetarians, folks that love to travel everywhere (crazy high cost of living here and I don't want a roommate), I'm far less established financially than others my age (was in a doctoral program that ate my 20s) which makes me less hesitant to spend money, a lot of my interests are more hermetic than many folks enjoy (I sure don't blame others for that but it does make things harder), and folks have kids (nah)/want kids (I'm increasingly leaning towards no as I get older).
I have noticed many profiles having a list of some size in terms of what they're looking for. Like they're buying a laptop or car and want it speced out. That might be part of why they're still single. I see someone I kinda dig, see a list and something on that list doesn't resonate with me, and I just assume they aren't going to be interested. An example would be "I'm not interested in Republicans". I'm independent and don't vote straight ticket but that statement comes off as someone that doesn't want to hear opposing views. So why bother? I already send non-sexually charged messages that don't get responses.
It's funny cause I moved from the Southeast US because I felt I was too liberal and now in New England, I'm too conservative.