The following is from a newspaper article on this subject.......
"Todd Mitchell an analyst at Kaufman Bros. had a different take. Michell believes Ergen wants XM's satellites and ground network. XM's satellites occupy strategic orbital slots that would be very attractive to Dish and Echostar because XM's satellites have a better line of sight to more locations he said.
The XM satellites, if obtained by Ergen at a discount would "significantly enhance his own competitive position," Mitchell said. "I think that's the primary target here."