I suspect we'll never see any detailed discussion on the issues you raise, Temis
, because many of those variables will differ from show to show based on the financial models present.
With the specific case of BSG, we can draw the conclusion that the show is making a profit for Universal. Otherwise, as the article points out, they wouldn't be laying out money for more product. Ergo, the ratings don't effectively capture BSG's full earnings power. The same may or may not be true for other shows.
Beyond that, we'll never know as businesses aren't likely to get into the nuts and bolts of those things with the public. However, I do think it's interesting that technology has changed things to the point that the old measures of success are no longer the only means of determing success.