Some categories favor Japanese cards by a wide margin
The 1st Edition shadowless print run, where the drop shadow was removed from the card frame before Wizards of the Coast caught the error, is the most historically significant version of the foundational Pikachu card
Draw Payoff Permanents whose abilities fire whenever a card is drawn, turning each draw into damage, tokens, counters, or life loss
Part of it is that tangible commodities (like Magic cards) feel like better investments to some people during times of uncertainty, and part of it is that the cards that are spiking are relatively safe Commander staples and Reserved List cards that will likely not be invalidated by future shifts in the metagame
Lastly, getting your cards graded by professional grading services like BGS, CGC, or PSA will help ensure their authenticity and value, especially when it comes to reselling