Yeah, its a cost, but so many decks actually need some in the discard pile to pull them back with abilities
You can only activate 1 "Top Share" per turn
You can do this to an active or benched Pokemon card
They created silly moments and allowed players to get creative and make their own jokes, but the more impactful, mechanically relevant stickers were the ability and power/toughness stickers, which allowed you to permanently alter a creature
For starters, I love creatures with variable power and toughness, especially when there's an X in the mana cost
Different platforms take a different cut of the profits (10% from TCGPlayer, 10-15% from eBay) and you'll find cards are more or less likely to sell on different marketplaces