In reply to: Tim Brown's Heisman fetches $435k at auction posted by thecontrarian
from selling their trophy.
I think you are supposed to read the sentence in question to mean that awardees from 1999 forward have been barred from selling their trophies by the trust that oversees the honor.
All the sales listed are by people who won it before 2000.
I'd imagine they rewrote the bylaws of the award to prevent any winner from selling as part of their ownership transfer. Prior to 2000 they probably never considered it and simply handed it over as you would any other gift/award.