That's the sad thing about trading card games. I think they're neat, and like how the rules and strategy work, but the defining business model of "rarities" and blind packs making it a wallet war seem almost built in to the game itself.

I guess the alternative is simply to have collectible sets with known cards in them maybe? I guess like how miniature warfare games use point-buy systems so you have to weigh which units you want instead of just fielding a ton of the most expensive / powerful ones.