Even if it just "scales" badly, it could be a funny thing...
"YEAH... we will threaten to crack the surface of Earth with a Boom Box! Think about all the billions and billions of dollars we will make !"
"Hmm... Boss, I just punched some numbers... we could do what you suggest, but the necessary boom box would be a little bit larger than Earths Moon."
So it will (most likely) have a "usable operational range".. for everything larger it will be not a valid weapon.
"YEAH... we will threaten to crack the surface of Earth with a Boom Box! Think about all the billions and billions of dollars we will make !"
"Hmm... Boss, I just punched some numbers... we could do what you suggest, but the necessary boom box would be a little bit larger than Earths Moon."
So it will (most likely) have a "usable operational range".. for everything larger it will be not a valid weapon.