I thought I will narrate my experience to all so here it is . These folks basically rip you off. They let you run their ads till you reach a balance of lets say $50 which is minimum payable. Thats of course after several hundred thousand impressions. And then when you wonder why you did not get the payment... boom they convert your account to another type because of low signups (of course after several months) In my case they converted balance fo over $62 to $1.29 overnight !!!!!!! Beware
I'ts all in their TOS, and most Adult sites like this all do it ! Better go with dating offers througg Afilliate networs such as CJ. They have very good affiliate programs for the dating niche.
You probably got 'bad traffic' in; too little free sign ups versus impressions and clicks. I have been making thousands of $ with them for 4 years now; they never let me down and I never had trouble with them. I recommend them to anyone if you have the right traffic (I'm writing an ebook about how you can obtain this kind of thing).
I've had good luck with AFF. I think being converted over to signups is actually better in the long run. For the past year, I havent promoted them very much but I still make a good amount because of people I referred the year before renewing their accounts and such!