Their website is www.helpourmarriage.org. I believe the 80% figure refers to a 5 year success rate for couples that have gone through the weekend and the post sessions. This is a very good success rate.
The price of the program varies by the place, as it is dependent on the cost to host it. Most places just ask for a deposit before the weekend, and the balance is collected at the end of the weekend in the form of a donation. I am surprised that in this case, the entire cost was billed up front. As someone suggested, they must be holding it at a hotel which required payment.
