The problem is, these people want to see their own team on their own RSN live in HD. MLB.com blackouts out the local broadcast (at least delays the broadcast).Not to add fuel to the fire....but I was able to test the home and away feeds in HD last night from MLB.com. Looked pretty good. Might be a good alternative if you need all the games in HD and don't want to use DirecTV.
The other point they are making is that they are paying for a local channel to provide local programming in HD and Dish is not delivering the product to them all of the time.