south,

I'd guess it is because they attempt to get and retain the largest possible audience. They therefore try to avoid alienating their audience by airing pieces that are out of their mainstream. Nothing edgy, nothing that may make someone switch channels.

Hell, that's why classical radio has, for all intents and purposes, with very few exceptions been relegated to a niche market status. The market for deodorants, douches, and prophylactics isn't there, so the only advertisers left are the arts organizations themselves, financial advisors and large company PR efforts. You can make a living there, but the big bucks, the way to the top lies through packaging and presenting the popular pap in a fashion which will drive the numbers up.

It is the same with commercial television.

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Eudaimonia