This is true. The seller has to weigh how much they can get for those points if they were to leave them untouched when they sell. Certainly, they can try to recover the MFs paid on those points from the sale. If the amount that the agency pays owners isn't enough to offset the dues plus any per-point premium they could get from resale, then it is much smarter to just sell as is without trying to move the points around. Personally, I would either do a transfer or try to rent the points out on my own before I considered going through an agency if I were in a position where I wanted to list and close ASAP. At the very least, I would take a last-minute trip to use those points up.