They will protect your cards, and can be used for your rare cards or deck that you don't want to damage
In fact, some of the most expensive Pokmon cards ever sold are Japanese exclusives: the Pikachu Illustrator card (a 1998 Japanese promo) set a record by selling for about $5.27 million in mint condition, far above any English card sale
Defrosting Ice Queen: Mai Valentine for the first few arcs, and then heads back to Arctic levels during most of Season 4 due to her FaceHeel Turn
Let's say that when Greed is bought out, not only are all of the copies on TCGplayer purchased, but so are all of the copies on ChannelFireball and Card Kingdom as well (which isn't all that uncommon, especially for old, low-supply cards that don't have much supply on the market to begin with)
Overview Regieleki VMAX powers up your Basic Pokmon with its Transistor Ability
So yes, I think I would be happy if I had purchased them, though I dont have $1,000 to spend