The Jewish sabbath begins at sundown on Fridays and runs until sundown on Saturdays. Friday night is also typically date night, and the evening when office coworkers grab a bite together after work. It's the night when kids stay up later, and parents spend time with them - and forego the shows they love, even at 9:00 or 10:00. The logic of programming an exciting show with intellectual intrigue, enticing plots with artful execution, romantic leads and non-leads, and three hunkly Jewish characters on Friday evening and at no other time certainly eludes me. Three generations of my family enjoy NUMB3RS, but we mostly would watch it by recording it - very rarely on broadcast.
Just a thought.