Maybe there could be a Cell Amenitie like a piggy bank that could either increase your bank account max deposit by say 10,000 or you could just put the money straight into the piggy bank?  

what if someone stole your piggy bank? Not only will you have wasted some favors, but you'll also lose everyting that was in your piggy bank I don't think that's a good idea pokemon master dude.

Thats true but maybe it can't be stolen?

WAIT you can steal amenties? O.O?

No you can't, I was simply joking. You can double the size of your bank acocunt by purchasing a respected status. No one really needs a high bank deposit btw.

Yeah,i think that interest can be little higher   

With this now,it takes a LOT time to bank start makeing some good cash,so nobody use it...

I was starting couple times,but always after few days see something cheap on market and spend all

Damn

STOP! piggy bank heists today!

With the Piggy bank 3000