The whole concept of sweeps for TV shows is extremely flawed. Create hyped "event" programming a few times a year and ad rates are based on whatever ratings they can pull in for those few times. Shouldn't the ad rates be based on ratings for an entire season of shows? I can't believe this is the system they use! How stupid are they? It's because of this that NBC is constantly showing repeats during the middle of season. I remember a time when repeats were only shown in the summer.