Ok its a stupid idea but it will help.
Maybe we can save a bit money that will not have wealth. So what i think we can do is : When you play for 1 hour or something, 5 % of your bank money goes to the savings, as you can go to the bank and withdraw some money, you can do that with savings.
Playing 1 hour with 1M on bank : 1.000.000 : 100 x 5 = 50000 added to your savings. (You cant put money onto your savings)!
This is verry usefull when you see good business, houses or when you owe someone money.
I think 5 % is good. When you got 5M in bank you got 25OK added to the savings, after 1 hour. Answer the poll how much % you would like.