yeah - the bank would help with how much money you'd get in such an enormous world. And they could have one in every city.
And a good point about the money really being worthless. They should make some items that you need to finish the game only available in some shop somewhere. And pay tolls for some things. Make a lot more mini-games to take your money away... And they should make potions more valuable too. Like cheap and easy to find at a shop - plus making fairy fountains really hard to find. And making it so you cant catch fairies in bottles yourself - or not straight away anyway (have to get some kind of magic fairy grabbing gloves ora net or something).
I'd like to see it go back to the same rupee colours as
OoT, myself.
(spoiler:highlight to read)
Have you seen the thing in the trailer in Taoru village where he uses the bird to attack the bee-hive. If you listen closely to the guys words you'll see he says something about the Bees making the money out of their honey. Honey honey.....I've got a lot of money...