Well, I have 6 receivers on my account. I have 3 kids and a wife that all like to watch something different.
It was my understanding that you could have as many receivers as you wanted as long as they were all hooked to the same land-based phone line. I didn't know about the limit of 20.....
I can't get cable or OTA tv reception where I live so satellite has been the only alternative, been with D* since 1994.