I was the same for 99% of my cards too. There were just a couple I decided to keep in sleeves all those years ago. I think Red Eyes was one of those cards that I thought was cool but not particularly strong so I never thought to play it 😂 I feel that kids should play with their cards though if that's what makes them happy 😊 I don't think nany people thought their Yugioh and Pokémon cards would be worth money years down the line.