While I think some cards are absolutely gorgeous, and I wouldn't mind owning them as pieces of art, I've never had any interest in actually playing the Pokmon card game
Resolute Reinforcements If you are not a fan of red decks, but do care about Mono-White Aggro token-based archetype, then Resolute Reinforcements should be an auto-include for you
While setting up bots to automatically farm PvP and collect rewards is a quite involved process, requiring the use of macro software and emulators in most cases, it is possibly the most powerful cheat out there for the game, allowing players to farm near infinite packs, cards, Poke Gold, Shop Tickets, Shine Dust, Hourglasses and other goodies over time
And "milling" has only ever worked because of how in-tune everyone in the pit is to Magic lingo, but it would not work for your average person who is picking up the game anew
Good ol' Inkwell Leviathan
Plus, Japanese sets are often released more frequently than English sets, giving collectors a wider variety of cards to collect