Maybe I'm just naive, but I can't imagine that signal theft is really that big of an issue. I would think we're talking about very small fractions of a percent with regard to net income.
Being in installer I can tell you it was huge. You ever wonder why so many houses had a D* dish and an E* dish. Yep they were stealing Dish Network programing. It was huge in the Detroit area and just about any area that had a large forien population. I can say at one point I was seeing 3 to 10 people a week that were stealing signal in way shape or another.
The real sad part about it is these people did not feel that what they were doing was wrong. Almost all of them said that it was in the air it was free to receive.