I contacted Wedding Wire one day and received a call from a salesperson. They have a minimum one year commitment. The price I was quoted at the time was $850. I said no thanks.
Honestly, I wouldnt mind the price if I was guaranteed it was going to be a money maker for me, but I'm not going to drop that kind of cash without a proven return on it.
I have only been a part of one other website similar (Atlantabridal.com). I paid $50 for one month and didnt get so much as an inquiry. I put up my ad, put up my pictures, posted my availability - did everything I was supposed to - but ultimately got nothing.