Ninja decks utilize cheap and evasive creatures, and white can provide a lot more options for this strategy
Chocobo Knights Chocobo Knights live in a world where white decks and white-adjacent decks all have seemingly endless access to +1/+1 counters
When building a list of the most expensive, you have to refine your discussion to either include or exclude these three sets, as you would never make it to a consideration of the expansions or later traded cards without excluding these
Anyway, yeah, factions
Everyone loves Treasure tokens, of course, so theres going to be some degree of hesitancy to destroy the enchantment in the early turns
Sure, they get sacrificed at the end of turn, but do you care when a pile of Combustible Gearhulk copies, or Inferno Titan duplicates, already left your opponents in ashes