They are more expensive than standard-size or penny sleeves
Participate in Events Events are a great way to earn rewards, with some offering guaranteed rare cards or a large number of packs as prizes
Even if Easy Prey can't be used late-game, you can discard it to find something potentially better from your deck
That does not mean every pack contains an SAR, premium mirror card, Eevee-family Pokmon ex, particular illustration, or card with a particular market value
These include the Battle Bus and Supply Llama as Artifacts (Battle Bus is a vehicle, and Supply Llama an artifact creature), a battlefield wiping sorcery called Shrinking Storm, and even a Dance Battle enchantment
Given that cards such as Bravery Charm add 50 HP to a Pokmon but only if its a Basic Pokmon, being able to add 100 HP to any Pokmon is very powerful indeed