Below is the scenario that prompted this thread. You'll note that the seller involved did not do anything wrong. He/she asked for the extra $1pp before any reservations were made.
1. I respond to a thread indicating points available for rental @ $10 per point
2. The seller notes points still available and agrees to check availability w/ guest services
3. I confirm my serious intention to move forward with the transaction. I also confirm the dates I'm looking for, type of room and verify the $10pp charge. As a newbie, I ask if there are any other taxes or fees associated with the rental of points.
4. At this point the seller responds that an additional $1pp would be charged for maintenance-type fees (can't remember exactly the description).
5. I ask the seller not to proceed.