According to priceline,

"Accordingly, as a condition of using this Site, you agree not to use this Site or its contents or information for any commercial or non-personal purpose (direct or indirect) or for any purpose that is unlawful or prohibited by this Agreement."

Betterbidding.com or BFT all violate their terms of service. People are posting Priceline's contents or information for non-personal purpose and these two sites are using these information for commercial usage (solicit people to go through their affiliated link businese by providing these information.)

As an update, we're going to provide a new kind of service in the near future, it will 100% follow priceline's term of service and I can guarantee you that with this service provided, people will NOT go through betterbidding or BFT's affiliated links in the future. (Detailed info are confidential and I can't talk more about it at this moment.)