NBC chief Ben Silverman is making it clear: Fan love for "Chuck" helped ensure the show's survival for a third season.
And he's making it just as clear that lack of passion for "Medium" and "My Name Is Earl" doomed those series.
In the case of "Chuck," Silverman said, "Both the fans of the shows that matter and the advertisers of the shows raised their hands to say, 'We need "Chuck" on the schedule.' We will send you Nerds. We will buy Subway $5 footlongs. We will do whatever it takes." - Source.