Charge per lead and promise that you have 7 days to qualify the lead. They then send you bogus leads where the buyer isn't thinking about buying for a 6 months or a year (impossible to know if the lead will be qualified in that time). They won't take those leads back saying time to buy or sell isn't part of the deal. If you ask to leave the program within the time period you are allowed, they charge you for all the bogus leads including the ones that they did agree to return. Total scam and terrible response when you want out.