But what happened to summer being all repeats and trials for the "grand stage" of fall?
Yeah, I'm very familiar with commercial buyrates and ad spots. Thanks for the refresher. That's why summer content is less expensive to produce (hence, the inflation of reality shows). But the big networks in the last 4 or 5 years have put emphasis on creating new scripted content for Summer like Rookie Blue and Mistresses, so it's not a red haired step child. It actually trumps midseason for developed creative content (not in ad rates, of course) because March/Spring is overrun by sports.
Anyway, the BBUS comparison is unintuitive because the U.S. structural model (especially for a top broadcast network like CBS) is so vastly different from Ch9's. BBUS is a success in its own right and not in spite of premiering in the summer. It brings in good revenue from live feeds which are still very popular and is the unofficial flagship for CBS summer programming. BBAU's standards are more than likely much lower despite it's "flagship" status on Ch9. Treating them the same would overwhelm the expectations of BBAU despite it being the better show IMHO.