Do they impact TV exposure at all, as far as which teams are selected for which networks and which time slots? I would say they do. If so, and if being on a certain network in a certain time slot matters at all, then I would say weekly, regular season polls do matter. On the other hand, if rankings are a non-factor for the networks, or if being on one network at noon is just as good as being on another at 8:00, then I guess they don't matter.