First off Nick, your signature says you don't like IBOC, yet you post about listening to HD channels and complain about the formats. I just find that interesting. I don't like IBOC either, and wouldn't be caught dead buying one of the radios. Truthfully, I don't think I'd take one if it was given to me.
Secondly, and more importantly, I can't believe your disbelief of what's on "the station's between the stations". Haven't you figured this out yet? The station owners/management don't care what's programmed on these channels for a very simple reason. NO ONE IS LISTENING!!! And, if no one is listening now, how many do you think will listen once they start running spots on these stations next year???
The ineptitude of this business as a whole is why HD will never catch on and more than likely go the way of AM stereo within a few years. The entire idea was botched from the start, from the technology itself, to calling it "HD Radio", to the marketing of the radios. Every square inch of the plan has failed miserably. If the industry could have settled on the technology sooner and launched it before satellite and internet became options, it may have had a chance to survive. They didn't, and it won't.
Another meandering thought...most of what's programmed on "regular" terrestrial stations isn't any good, so why would you expect something on a secondary programming outlet, run by the same people, to be any better?