This is exactly true. Match.com seemed to be legit 10+ years ago, but these days it's a total scam. I signed up for an account there recently (since I'm back in the market and all....), since I wasn't getting far on OKCupid, thinking I'd try a different site to see if there was a different crowd of women there. It completely reeked of being a scam; I never did give them any money, thankfully, but the signs were pretty obvious. First, while it was possible to fill out your profile for free and look at others', so many things required a paid account: receiving mail, seeing who "liked" you, etc. And second, just how many "likes" and emails I received, even though I hadn't mailed anyone else. For a month or two after signing up, I was barraged with emails saying I had received personal messages from women, that tons of women had "liked" me, etc. Yeah, bullshit. I've been on OKC more than long enough to know that men almost never receive unsolicited messages from women (and when they do, those women usually aren't too desirable, sorry to say). There's no way I'm getting tons of emails from beautiful women after sticking up a profile and a couple of photos and doing little else. Anyway, I kept getting emails from match.com for 2-3 months after this, constantly trying to get me to come back, pay money to read these supposed messages, etc., but it finally stopped.
As far as I can tell, most of these dating sites these days are scams. OKCupid seems to be completely legit; I haven't seen anything that reeks of fakery there, however the male:female ratio is of course poor as you'd expect and women who are at all desirable get bombarded with messages from men. From what I've read, eHarmony seems to be legit, but it's also completely geared towards conservative Christians so if you're not one of those, then don't bother. AFAICT, Tinder is completely legit too, but it's not a site at all, really more of a hookup app and because of its lack of detailed profiles, doesn't facilitate finding compatible partners.