Anyone who has been around the business world probably knows this. Years ago I worked at a job where I'd have to plan travel (not a hard task as the company had a travel agent) and she explained the perk system to me.
A few years later (as we were starting to fade) we'd frequently plan to go to a different convention (easy to skip most of it) and we always just booked where we wanted to stay. I doubt we ever paid more for the same type of room. Plus we'd get the points, or whatever was on offer.
Always good to know how things really work.