Reader mail: Cable vs. network budgets, 'Grey's,' 'Defying Gravity' and more

Do to a technical snafu, I didn't get to post today's column, a reader mailbag, until just now. The main item is about how cable networks are able to produce dramas that get much lower ratings than on the networks. The short answer: cable shows are much cheaper. (And I have a few numbers illustrating that.)