One mana for a 1/1 token seems like a pretty poor deal when it is a Lab Rat (without buyback)
Either way, its a powerful pickup for Knight, token, or white-based Commander decks, and one thats likely to remain popular
Having two Curse of Misfortune, Curse of Opulence, or Curse of Echoes out at once is too good an opportunity to pass up on, while also providing a backup for if the original version gets removed somehow
Because these are the Pokmon that require the least support and are the easiest to get into play, often Basic Pokmon cards are the foundation for entire decks because the player can get them out quickly and start racking up damage
Given their condition and rarity, finding appropriately priced cards on second-hand marketplaces like Amazon and eBay may be difficult