I know he has every right to sell whatever is his, but it seems like you are capitalizing on your teammates and the shared experience. Let your kids/heirs sell these down the road instead. The interwebs say he is worth $75M, so you would think he doesn't needs the scratch.
https://www.espn.com/olympics/story/_/id/37734838/karl-malone-nets-5m-1992-dream-team-collection
https://www.espn.com/olympics/story/_/id/37734838/karl-malone-nets-5m-1992-dream-team-collection