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and there are a few reasons for that

Secret Rares pushed set numbers beyond official counts, creating early "chase card" culture

Black Rose Moonlight Dragon X LIGHT Level 7 [ Dragon / SynchroEffect ] ATK 2400 DEF 1800 1 Tuner + 1+ non-Tuners If this card is Special Summoned, or a Level 5 or higher monster(s) is Special Summoned to your opponent's field: Target 1 Special Summoned monster your opponent controls

Crush Card Virus Crushing player dreams Crush Card Virus represents the extremes of what can happen when the most powerful cards in Yu-Gi-Oh

But it also can be used to discard a card from your hand to draw a card, and then play the discarded card

It seems that, while there are not a great number in existence, their numbers remain fixed due to one's power transferring to an eligible human before death