[yellowapple]

I actually had a similar idea about radio stations.

Currently, FM radio stations are so typically clogged with commercials that I just switch back and forth whenever the music stops. The sole exception in my area is KZTQ "Bob FM", which has a neat policy: 60 minutes (ish) of nonstop music (aside from their normal station ID stuff), followed by at most two or three commercials, then repeat. I've found that the commercial breaks are short enough that I'm more willing to actually listen to them, since I know that the music will be back in less than a minute or so.

I reckon that has a significant value-add in terms of ad impressions, and thus could offset the normally-decreased ad revenue by charging more per ad.