I have noticed that the original querry of this thread has never really been answered in terms of what can one get by spending the $68 on Mapmaster that one was unable to get before.
When Motorola shut down the NAS (National Authorization Service) for TVRO the only choice for programming left was with HITS (Comcast media center). A lot of people had to do a MR (Master Reset) to receive HITS which caused them to lose the generic satellites. Thus they could no longer find ITC channels and perhaps lost the ability to use 4dtv as a dish mover.
So MM will bring back the generic satellites and also allow you to make a nice dish mover.