The 500 attack/defense boost is actually very relevant as it brings Chocolat and Glassouffle to the important 3000 Attack/Defense threshold that often defines powerful boss monsters, and it makes it easier to assemble lethal damage, even without access to the Extra Deck
A hardcore Power Packs account says that, while manually tracking the card, they witnessed the Charizard leave the pool "multiple times." Since the Charizard is still on the list as of this writing, it appears that this mysterious winner took GameStop up on its buyback offer
An interesting attempt at a more general set (without specific individuals)
Some earn their place for making nonsensical plays from the anime into real strategies, while others have effects that truly support an archetype
Performapal Barracuda X EARTH Level 3 [ PlantPendulumEffect ] ATK 500 DEF 1100 P Scale 5 Once per turn, if your "Performapal" monster battles an opponent's monster, before damage calculation: You can make that opponent's monster lose ATK equal to the difference between its original ATK and current ATK (even if this card leaves the field)