Just to further explain why this might be legitimate --
In I-Love-Dopey's case, if the person had called and made the reservation and then Dopey said "thanks but no thanks", the person would have the points go into a "holding account". They could only be used to make reservations 60 days before check-in and would have to be used by the end of the person's current Use Year. Just that one phone call, would put many restrictions on using these points. If your reservation is 31 days or more away, I'm not sure why they want payment "before" they can guarantee securing the reservation.