Like other trading card games such as Magic: The Gathering - whose publisher Wizards of the Coast originally handled the English release of Pokmon - the appearance of Pokmon cards has remained fairly uniform since its debut in the nineties, allowing players to use older cards alongside newer ones in their deck without being able to tell which cards are new and old just by looking at their backs
Marketplaces like ChannelFireball, TCGplayer, and Face to Face Games just dont have the manufacturing capabilities to produce their own custom sleeves and they likely outsource that work to these sellers
I could only imagine a deck that plays a few Chansey, and Peonia [Chilling Reign], and keeps attempting to draw extra Prize Cards
Older cards like the 1999 Charizard can sell for well over $100,000 in good condition due to limited prints
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