cool line art How much can it cost in promoting for the radio?? This is the question I am asked every day. There is a lot of confusion out there about simply how much radio advertising costs. With a little knowledge and knowledge of how radio works, we can easily answer this question. Because net profit? Just like the expense of a five star accommodation on the four seasons differs from ?Moe?s motel and eat?. The costs of radio advertising vary greatly from station to station determined by listenership.