Probably closer to a few hundred if even that many. Most people who have Dish HD didn't even know that these other channels exist. The members on this site make up a very small fraction of their actual customer base and the fact is most people think that just having an hd receiver means they are getting hd.
The way they have been calling me, even after me threatening them legally to stop calling me, I would say they are pretty hard up to "get back" those of us that left Dish because of lack of HD adds. When my cable company caught up and I was paying twice for everything but Voom, I knew it was time to get rid of Dish. I like the idea of their HD only package. If they keep adding channels and get ahead of cable once again, I'd easily re-subscribe to them with the HD only package and maybe switch my Starz back over to them from BHN. BHN has the better premiums with everything else though at this point.
I never understood why DirecTV or Dish didn't carry all 26 HBO/Cinemax's and a 20+ Showtime/TMCs. Both of them are missing various things like Showtime Beyond, Showtime Women, HBO Zone, @Max, etc. If I am going to pay for Cinemax, I want all 12 channels, not just the east and west of the flagship station and Mormax East. In all honesty, before HD took off, the lack of premium channel multichannels has been what has kept me for exploring satellite in the past. BHN offers all possible premium multichannels. I am not crazy about them not having Cinemax HD or Starz HD, but they have everything else.