You are proving my point for me, although you may not even realize it. There is only so much room for channels on Directv, since they don't sacrifice quality for quantity like Dish does. They have made a corporate decision as to what they think will give them the best return on their investment, just like any company does. I'd like to have many of the channels you have listed, but I also want the ones I have to look as good as reasonably possible.
However, there is also another possibility to why DTV hasn’t been actively pursuing HD program upgrades.
DTV may simply aim to become an attractive “takeover target” by beefing up its balance sheet (cutting down on programming expense) for past few quarters. Or, there is always that other possibility that a merger is in the works between Dish and DTV - DirecTV-Dish merger would create a pay-TV power - NYPOST.com