I wasn't saying that the transmission had anything to do with it. I think you misunderstood what I meant. Dish is the cheaper and easier target because it uses an open system that is easily received by off the shelf receivers. DirecTV is more of a closed system, you cant "buy" their receivers anymore, they are all leases, and their transmission is a closed system as well. Piracy will go to the easiest and most economical way of compromising the signal.
It is generally believed that that (economics) is one reason that there was never a VCII+ (Plus hack) released. By the time the VCII datastream was shut off (especially the commercial data stream) programming prices were cheaper than keeping a broken board going. Had the programmers offered their services to TVRO users at reasonable prices (what cable paid or less) in 1986, there would have probably never been a wide acceptance of broken VCII boards back then.
I bet now that a lot of Dish's trouble is in Canada where they want the service but can't get it without a lot of trouble and the same for Dish, it is probably much harder for them to go after the dealers that sell the equipment and service to compromise the signal in a foreign country.
Canada is always going to be a problem. The international channels are also a big draw, especially with Arabic and Indian customers.