Further adding to the demand for this card and hence the uptick in its price is the fact that outside Japan, South Korea, and China, it has been many years since this cards most recent release
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On the other hand, for products like Secret Lair drops, Commander decks, or other preconstructed / box-set supplemental products, we used the cost of buying the sealed product (which is generally lower than the cost of buying all of the cards in the product individually) from around the time the set was released (for sealed product, you'll often pay much more if you wait until the set goes out of print to try to buy it)
While some may argue that Pokemon cards are more valuable because Pokemon itself is a monopoly, or that the game is played by more people (it could be argued that more people play Magic the Gathering more seriously), economics tells us that price is determined by supply and demand factors
For example, Performapal Pendulum Sorcerer one of the most iconic Pendulum Monsters in the game gives all your Performapal monsters +1000 ATK until the end of the turn whenever a Performapal Monster is Pendulum Summoned
4Japanese back design (gold border) is correct for 2010-Present era cards