The premium for a gem copy over a raw near-mint one is large enough that an authenticated slab is worth the cost and the peace of mind
Rakdos is a bit different in that he can be a one-sided board wipe, but there arent that many other Devils, Demons, or Imps worth playing, and hes risky to play anyway since you could end up wiping your board and not affecting your opponent at all, so he never really took off
Lunala 185 Alolan Raichu ex Lightning 140 Psychic (60+) This attack does 30 more damage for each energy attached to your opponent's active Pokmon
That equates to a percentage value increase of over 3,000% - which is absolutely huge, but $1,000 is not a completely bombastic number
Tyranitar V Tyranitar V is our huge OHKO Pokemon in the deck, similar to Lugia VSTAR, with four Powerful Colorless Energy from the last format