Has anyone really used any of the real estate and mortgage cos. like Lending Tree and Cendant to buy or sell a house? I understand that one should not be a slave to earning miles but it's hard not to believe that you couldn't get a better deal for financing a house purchase through a banker who is NOT affiliated with Lending Tree/Cendant et al. There's always a hidden cost built-in, right? Am I too cynical about this? I really want to earn more miles this way but am very suspicious...