NBC’s new series, “30 Rock” and “Studio 60 on the Sunset Strip,” are not what could be called ratings hits — yet, on the other hand, they’re both still on the air. “These two very different behind-the-scenes looks at network intrigue were among the most vaunted shows of the fall season and did not meet expectations, yet both survived the midseason tumbrel. Turns out cold-eyed corporations don’t always look at the bottom line to determine the fate of fledgling television shows.”