I live in Anchorage Alaska, up here, we are stupid if we don't get some kind of earthquake insurance as a part or on top of our homeowners insurance. I'm sure that in other parts of the country, where tornados or hurricanes, tsunamis, valcanos, ect are a threat, there is, and smart people do, get similar insurance.
For a company, with millions of subscribers, to open the Pandora's box of replacing a customers equipment for free "out of the goodness of their own hearts" would be incredibly bad business and could create a precedent that could hold up in court and force them to replace any number of satellites and recievers for who knows how many victims of lightning strikes, earthquakes, heavy wind storms, theft, vandalism, or any number of things that could happen. Remember that these instances and the different possibilities of what could happen grow exponentially with how many subscribers Dish Network has.
Dish Network should be looking out for their customers, but they also need to be looking out for their investors as well. These are complex issues and are not as easy as "lets do the right thing" there are many different things that could complicate the matter.
This is what insurance is for. Make sure you read your homeowners policy and make sure you'll be covered in case of different types of disasters. If a huge earthquake strikes Anchorage tonight, my satellite and reciever will be covered, because I know my homeowners policy very well, and I made sure to get the right type of coverage.