T'is a bit methinks. I'm on match too, and because I'd like someone who is in to horses I've also signed up to two equine ones >.<
tbh it seems unless you have a picture in your profile you'll not hear much at all (may be different for women I don't know). I've only emailed a couple of people, and the only one who has responded was one who was down for friends only anyway.
Tisonlyme, a friend of mine is also on plentyoffish and she's met a few people from there, but no luck really. Seems to be full of people who are married, after one thing, or are complete idiots. I hope you have more luck!
At least PoF is free though. Read an article the other day about some dating sites being accused of entering false profiles to attract people, emailing people who aren't full members to get them to sign up to read the msgs, contacting when the membership is about to run out etc. Does make you wonder who is and isn't real, who's being honest.