Suggestion: add another button to the purchase x1 x10 x100 and max. Something like to next unlock. This would make it easier for the moon to advance, since the unlocks are all different. Say i have 180 cheese mines and i want to get to the 256 unlock. Use the purchase to unlock button! It would show how much it costs to get to that 256 mark, and if i have enough money, buy it! Maybe have this button be unlockable, or available from the start.
Actually, I did the math... If you want to find out what comes after the 2nd bronze coin (the one after that gold green coin) Then you would have to wait about 13,888 Days, so about 38 years.. OR you could just hack it