Are right wing pundits like Bill O'Reilly and Ann Coulter certifiably nuts?

Some think the more high-profile right wing talking heads such as Bill O'Reilly and Ann Coulter are really not that sincere and are just out to make money. If so, then they are not "nuts" but just opportunists, trying to gain attention and an audience by being controversial. Their commercial success would tend to encourage future highly polarizing positions on issues. My question deals with their motives - Do you believe they really believe what they say or write all the time, and do you think such strong beliefs makes them nuts? Or do you think we are all being "played" for fools, and they are laughing all the way to the bank?