They are just a popularity contest and nothing more. This is what you get when you have polls, voted by coaches and sports writers. Get rid of polls and let the conference champions make the playoffs. If Notre Dame doesn't want to join a conference because they are greedy, that is their problem. They can collect all the money they want, just are not eligible for a national championship. The problem is we have teams that want everything both ways, and we give it to them. If you want to have polls for fun, then have at it like the pro leagues have power rankings. They are for fun and mean absolutely nothing.
Say what you want about the playoff system, but it still depends on polls and anything that depends on them is a complete joke.