Master Hand would definitely have to pay the smash fighters, and of course, it would be in a lot of different currencies. Coins, rupees, gold, pokedollars...
I guess this thread is to discuss that idea and come up with currency conversion rates if you want.
Emblem Gold = yen
Xeno Gold = pound
So depending on the conversion rates between yen and pounds, either Shulk or Ike could visit the other's world and buy out a whole shop because his "gold" is worth more.
Rupees would be the same as rupees in India because they're called the same thing. I guess. They also look like gems, so cue Shulk sticking a rupee in a slot on the Monado and wondering why nothing seems to be happening/he's not getting any boosts.
A lot of amusing situations could happen here. Yeah. Discuss.