Yu-Gi-Oh is a high paying game if you get into the tournament aspect of it. Forty card decks selling for well over $1300. I used to play quite often, and with the top players as well.
Anyone who compares YuGiOh to Pokémon hasn't the slightest clue of how different the two are. Pokémon isn't as high paying as YuGiOh was/is, at least for me, but Pokémon is a bit more entertaining.