You can pay to get airplay. That's the entire business model of radio stations. We call it "commercials".

Assuming you're not in the business of producing music, you can even pay to have your stuff included in public broadcasts as part of the main programming rather than the commercials. This is called "product placement". (If your stuff was music, it would be "payola".)

You have yet to advance any argument that payola is a bad thing; you've limited yourself to "it's against the rules".