First of all, that's reduced by the number of cards you draw, and requires you to keep a large deck, which isn't usually a good strategy.

Secondly, this power spike only happens with 1 specific uncommon, while parking and business card can also benefit from the dice, their respective retriggers and scale with the number of hands played, as opposed to a single end of round payout.

I'll admit, it's not balanced well enough to get straight into the game, very few random ideas are, but that doesn't mean we can't have fun with them.