I believe and my players also believe that this upgrade needs to be made with an energy cost, since it works like an eternal stone that does not even require energy. For example, improving the accelerator - requires energy and other improvements also require, but an endless cobblestone in the amount of 9999 + a utilizer = 1000000 resources, this already breaks the balance of the game, I think that you need to add the amount of energy for each improvement so that 64 improvements to the cobblestone generator require a lot of energy so that the players do not seem to life like raspberries.

I don't know how Google Translator translated, I mean please add the energy cost to improve the cobblestone generator so that the cost increases based on the number of improvements in the mechanism.