The Grand Finale cards are awesome.
Serial numbered cards at this short numbering (/50, /100) were uncommon in the 90s and they were not all just parallels of the base set.
It wasn't like now when you struggle to open a few packs of Panini without running in to a SN card.
Hence, they do command high values. SPX being a more premium set helps as well.
The Olajuwon from this set is one of my top wishlist cards.
I don't know if I would bother grading it. Does having it graded a 6 or similar increase its value or resaleability? (I have no idea.)