I seriously doubt that a 2000P (or D) Sackie will someday command a premium that's outpaced inflation. OTOH, I have a few in pristine condition in 2 x 2 folders for my own personal collection.
As for the NIFC Sackies (mentioned by SsuperDdave), I'd save 'em.
As for the NIFC Sackies (mentioned by SsuperDdave), I'd save 'em.

















