For cable, none that I can imagine. Like Greg said, why would someone buy a device that steals the signal when they don't intend to steal it in the first place.

For Sat (but not in this case :) ) there can be semi legitimate reasons. For example it is not illigal for someone in Canda (US) to own a US (Canadian) systeme but it is illigal for the Sat companies to knowingly sell it to you and charge you. (they are bound to the national borders.). Some say since I am legally allowed to own it and you are legally not allowed to charge there is a grey zone in morality.