If threats are what win you the game, removal is what keeps your opponent from winning the game
Sometimes because of their collection value, sometimes because newer cards might be in better condition, and sometimes for the very simple fact that theyre cooler (ie, the art)
Theres no one out there that has PSA-graded cards by accident
Someone may tell you that a card you have is worth something, but really it's only worth what somebody is willing to pay for, and since nobody really plays the Pokemon card game anymore, I doubt you would get much
Game Designer: Play & Design, in response to my question about which decks and strategies Serra Paragon might best be suited to, would be to pair her with fetch lands: lands that sacrifice themselves to search your library for another land to put into play