You join for free, but you have to pay around $30 to be able to respond to messages. The website is completely useless unless you pay that fee, because you have no way of . You will probably get a few messages (canned messages; no way of leaving other contact information), and you will have no way to communicating with the other person.
It is clear that the owners do not care about providing people a useful service, but only in extracting money opportunistically while frustrating users and wasting their time.
Cons
-You will be unable to communicate unless you pay their fee.
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