They know very well they are scamming you, with the hopes of getting away with it. I was redirected from kayak.com with low rates for a hotel. After initial payments went thru, they surprised me in email that there would be additional charges at the hotel. The additional charges at hotel per day were higher than the initial amount I paid for it. Obviously I walked out and my vacation was ruined. I rebooked thru booking.com, they were honest, transparent and upfront about all charges before asking for any payment. Super.com refused to refund payment excusing that all charges are non-refundable. I am still fighting them with american express.