I notice that many of you take out a loan and never pay it back since it is more profitable to just keep it running. Thus I have improved upon the bank system by adding a gradually increased bank interest as you upgrade your bank level.

From now on every bank level upgrade increases the daily interest by 1%. The accountant will give you a reduction of 3%.

The cost of the upgrade will also increase every level to avoid witty players to max out there level as fast as possible.