One ambitious seller is currently asking for $30k / 26k for a complete graded set
You can get card sleeves, playmats, coins to show off your style, and repeat cards can be turned into Shinedust, which can then be spent to gussy up your cards with custom animations and the like
With that said, single-use effects are regularly used in conjunction with the constant effects, to further embellish your protection suite
If tails, the attack fails entirely, giving you a chance to disrupt their momentum and put pressure on the opponent
If a booster pack set is removed from Pokmon TCG Pocket, you can't open more packs or redeem your pack points for that set
The downside is that it can be really hard to gain any advantage if you cant get damage onto their characters without making bad trades (losing a powerful character of yours for a cheap one of theirs) or without completely banishing them