Hi ctsindy. During my career of using Marriotts, I tried this a number of times. The rule that was applied was that if I booked a block of rooms for a conference / party, I didn't get points etc. whether I paid or not. However, there was often a conference special allocation of points if I booked and paid for the conference facilities, but this was very variable. I guess that you may have already found this when you booked meetings there?
However, when I have taken the family on holiday and booked and paid for 3 rooms, I have generally been given the points for the whole bill … but this was only when I had paid the bill.