I think part of the frustration comes from sellers who have an interest in who they sell their house to. Once the deal is signed and the original buyer flips th

I think part of the frustration comes from sellers who have an interest in who they sell their house to. Once the deal is signed and the original buyer flips the house (buyer #1) the seller now loses control of who ends up owning the house. It might be legal but that is little consolation to the seller who might have had reasons to sell, or not sell, to some party.