>>528984016
Not him, but that's indeed how the math worked out in the original game. Here, we have park chests, which may skew the numbers a little.
Legendary cards vial for a lot, but you don't get many of them = not many vials
Bronze cards are plentiful, but vial for almost nothing = barely anything
Silver/Gold are reasonable common + vial for a lot = loads of vials
It's basically just a bell curve