It's ten times cheaper than any other upgrade I can do at this point. Upgrading a pump is cheaper than a single wall brick. And if the gold & grape come rolling in faster, I have to have that. I can't just ignore it. It's a large factor in the game.
A lot of people think they are completely worthless and that is why you see TH10s with almost max bases with level 5 gold mines/pumps. They offer very little other then being small meatshields.
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