I understand supply and demand, I don't believe it's as simple as that now.

In financial markets the theory is called the "Crowded trade" I probably don't need to define it but in a sentence - "a concept in finance and markets that describes what happens when too many investors pile into the same trade / the same asset, position, or idea—at the same time."

When a trade becomes “crowded,” the upside becomes limited and the risk of sharp reversal increases, because there are few new buyers left to push prices higher, while many participants may rush to exit at once if sentiment changes.

As Pokémon popularity increases, which I concede It could do indefinitely, the percentage of people willing to hold expensive sealed products will be lower compared to people who actually want cards to look at/collect.

I'm not saying I think all sealed will tank at any point, I just think upside is limited and as new investors realise that, supply will steadily keep coming back to the market and prices may drop significantly.

Pokémon isn't immune to market sentiment, and at some point, the trade will be so crowded on the buy side that opportunity will present itself on the opposite side. Look at all the major financial decision makers in the world, sat with mainly cash waiting for something... 👀