Regional Language TV vs National TV

I have always thought the regional language channels that serve general entertainment (non-sports, non-news) are much better than national TV (Z, Star, Sony etc.), in terms of the variety as well as the quality of programming. Why is the difference so stark? (If you disagree, do comment.) I believe regional language TV are doing quite well commercially too, despite covering programmes on literature, classical music, agriculture, dialects, warnings to fishermen, political debates, in depth interviews with non-celebrities, along with the usual serials, film based programmes, and possibly 'reality' shows. How is this feasible?