Instead of having to keep track of current coins and do quick math every time we want to spend any, Bounty could have an Upgrade button. When pressed, you would instantly spend 2750 coins but all your Bounties would now always run at 100% efficiency. You could then press Downgrade on any Bounty to get the money back or automatically when the last Bounty is sold. Not a functional change, just an easier way to reserve the maximum coins for Bounties.