I agree that is what it would take to get a high score on their site but I think it's an unrealistic expectation to suggest that the developer should be on the hook indefinitely for content. Each card game set is functionally a new game with some costs amortized thanks to it's previous sets.

We have seen the forever sticker price in mega hit indies ala Stardew Valley or Terraria but I don't think that is really healthy to expect for gaming as a whole and is more that small teams hit a home run.