The f*ck (profanity filter ftw) is this game? Buying cars doesn't give you more money in the end, it just wastes your energy faster: when having eg 100$ per click, wastes 1 energy, with car it gives 100$x5 and wastes 5 energy. WTF?
So not worth it!
And btw: The "Let friends work for you" sucks
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