Pokemon cards are up 3,400% since 2004

High grade vintage Pokemon is up over 3,400% since 2004, going by Card Ladder.
The S&P 500 is up 483% over the same stretch.
This year Pokemon is up 28% and the S&P is up 13%.
The shop owner who wrote that up says almost none of his Pokemon buyers play the game.

Stock Pokemon deeper into the holidays, or pull back because the buyers are all investors now?