It's an important statistic that exactly 0% of TurboHD and HD Absolute subscribers are viewing commercials on Fox News.That makes no sense. Why would advertisers care 'x amount of people COULD be watching this program'? They want to know 'Y amount of people WATCH this program'.
We're talking about the dynamic of big companies doing deals with big companies. The Viacoms of the world want to present the greatest demographic and ratings share possible when selling advertising time to companies like Proctor and Gamble to get the biggest overall deal possible. P&G likes the arrangement because it gets them significant exposure while eliminating overhead in the number of advertising contracts they need to negotiate, and Viacom likes these arrangements because they mean big solid chucks of revenue.
Each channel has it's own composite ratings value, so what Fox, Viacom, Disney, etc want to do is package as many channels together to present the highest overall viewer share to their advertisers.
These companies also know that some channels are more essential to viewers than others, so they dangle those as bait to get the cable / satellite companies to play along.
Notice how DirecTV, ATT (U-Verse), Verizon (FiOS), nor any cable company has been able to negotiate a "HD Only" package the way Dish was able to? That should be your first clue how much the actual content producers are against this type of plan.