As an American, I've been trying to get people to use the Everest, the amount of money it costs to climb Mount Everest, as the unit of measure for midlife crises and upper class indulgences.

(One Everest is around $50,000-$100,000.)

I know this was just a lighthearted comment, but for folks like me who like to take things too seriously... "grand" has the same value, and has the benefit of already being in common use.

Honestly we’ll probably just figure out how much a football field costs and use that.