I wonder if commissions have dropped a lot in the past ~5 years, or if your hotel just has a better rate. I remember hearing that average commission back then was in the 20% range (less for major chains with negotiating power), and I know that Booking/Expedia would be happy to kick down 8-12% for any traffic people referred to them. Any startup with zero volume could sign up for an affiliate account to get access to Expedia's availability and booking APIs and get 8% for each booking, and larger customers could negotiate that upwards. I think I saw 14% for one supplier, but I don't remember if that was Booking or Expedia or a smaller company.