When my kids find a show they like, I buy it on DVD, that way they can watch it whenever they want, and I don't have to deal with all the other self-promotion crap.
Right now they are on a High School Musical kick LOL. Thank Heavens they can shut their door, because if I have to hear that movie or its soundtrack one more time, I may go insane.
My elder daughter (17) was learning the dance moves off the DVD last night. I'm with you: after the first 40 times or so, you'd think they'd get sick of it, too!
A lot of parents are with you on that. The soundtrack is all the kids ever want to hear in the car. It is, however, very well done as made-for-tv stuff goes, and I'd like to have a chunk of the change it's generating.