It all just has to do with demand
Where to go: Pokemon Center stores (Shibuya, Ikebukuro, Osaka) official retail, lottery-based for popular BOX Nakano Broadway (Tokyo) Mandarake and specialty card shops with singles and sealed product Akihabara (Tokyo) Card Rush, Yellow Submarine, and dozens of small shops Convenience stores 7-Eleven, Lawson, and FamilyMart sell booster packs (typically 2-pack limit per person) Typical cost: Retail or shop pricing (no shipping or import duty)
We look forward to seeing you soon
They often have Colorless moves and abilities that make them useful in any deck, and often their attacks can get stronger based on the Energy you boost them up with, or your opponent's Energy
Sealed products such as the Pokmon booster pack or the booster box are also sought after, as they offer the hope of pulling high-value cards
This should gradually make PSA 10 premiums more rational truly scarce PSA 10s will maintain their premiums, while abundant PSA 10s will see their premiums shrink