If you paid for the cards they inherently have value else they would be free... Despite what many people choose to ignore, bitcoin has value - at the very minimum for illicit transactions online - its just not an as widely accepted value. Whether that acceptance will increase remains to be seen but to write it off as worthless is disingenuous
forget pokemon cards. Magic the Gathering cards are pretty valuable and you can definitely sell them for a bunch of money and buy a car or whatever. Ok, they have a use case because people play the game. But why do they play the game? because they feel like it - there is no "inherent value" to those cards either. Tomorrow, the game goes out of style for whatever reason and the cards are worthless. But today, while people like to play the game, they are valuable. Today, people shop on Amazon. Tomorrow, something changes and they stop shopping on Amazon and Amazon stock falls a lot. There is obviously a difference, but it's not as fundamental as people think.
what's the value of gold? gold has some use case, but its market value far outstrips that use case. The use case of gold is exactly this - that people trade it back and forth in the form of futures, etfs and spot gold.
You can't buy a car or toilet paper with your precious Pokemon cards.