Thats one reason older cards can be particularly valued among collectors
return 1 Fusion Monster from your GY to the Extra Deck, then Fusion Summon that Fusion Monster from your Extra Deck, by banishing Fusion Materials listed on it from your GY
For that reason, I think its particularly worth it for Rakdos Goblin decks, which can easily run the above combo, while still being able to effectively use First Day of Class when its used in a more straightforward manner
On the other hand, the long-winded introduction and rare subsequent usage allowed them to retain their godlike status and the thrill of their appearance in battle, even before we talk about their crucial plot relevance for the remainder of the series
600 The previous record holder for the most expensive card in history was another Pikachu Illustrator, which sold for almost $55,000 USD in 2013