So, in speaking to a friend of mine who has worked in rooming for a number of years, there are two benefits to the convention desk at the branch booking room blocks with the hotel. One is the comp rooms (usually 1 comp room to 20 booked rooms in the block) which has already been spoken about here. the other is that most all of these blocks are booked with the caveat in the agreement that the rewards points for all rooms booked with the chains that have loyalty points is credited back to an account at the branch office. Also, the chains are required to give standard loyalty points to the publishers who book the rooms - so they are not shortchanged on this somehow.
I think I've commented on this before, but the comp rooms and room points mainly benefit people who are in "special full time service". Typically, this is bethelites, traveling overseers, special pioneers, field missionaries, etc. This is mainly a way to reduce costs. You may have seen in the Yearbook the 8 figure amount that the organization spends on supporting these folks in their assignments. These comp rooms and room points for free rooms are typically used for folks in special full time service traveling on branch assignments.
For example, each one of the international conventions has three branch representatives from the branch broadcast department attending and these points or comp rooms would allow them to stay for free during the convention. Saves money basically.
I'm sure someone will completely flame me for the comment but the practice appears innocuous to me.
CC