binder bending cards The Original Monster Trading Card Album- 20 Side Loading 9-Pocket Per Page TCG Binder- Holds 360 Sleeved Trading Cards- Holofoil Yellow- Compatible with Yugioh, Pokemon, MTG Magic the Gathering and display. Jumbo Card Binder for PKM–

I think it's great and possibly the best opportunity to pull Illustration Rares in the Scarlet and Violet era, it's ending on a high note

Again, that's another simple answer: it's because that's what the rest of the industry calls this size of card

BT6-058 C Digimon Lv.4 Nanimon Color Black Cost 3 DP 2000 Digivolve Cost 1 Black 2 from Lv.3 Form Champion Attribute Virus Type Invader Card Text 1 [Effect] [Security] At the end of the battle, play this card without paying its memory cost

Recommended for players and collectors aged 10+

See rule 100.6

The most thought of example of this is the 1999 base set Charizard which can sell for well over $100,000 if in good condition