There is this big wall street bet on catalogs and their value. Who knows if it will pan out or if its a fad like NFTs.
I would think though that the artist, and sophisticated long career artist like the ones named above would have the best historical data to do a valuation of their catalogs.
If artists can trick wall street into overpaying for their catalogs (and still have some control on how their works are used), more power to them.
********** "Everyone has a plan until you punch them in the face. Then they don't have a plan anymore." (c) Mike Tyson