[Idea] Boost All Button

Currently, the boost all button does not serve any other purpose than not finding all of your buildings and boosting them separately.
I suggest that this be changed to provide a discount of Gem cost on boosting all the buildings scaling with the number of buildings available. It can be 2% per each building.
This would make it so that if you have 3 barracks running, and you boost all of them, you will get a 6% discount on the boost all price, hence making it much more attractive a offer to boost all the barracks instead of a single one, since its more cost effective. This is beneficial for both SEE and for the players.