Is radio promotion worth the money for independent musicians?

A recent Billboard article, Why Indie Artists Are a Rarity on Radio: ‘If You Don’t Pay, You Don’t Move Up,’ has been getting a lot of attention. But is radio promotion really worth the dollars spent?

Micheal Brandvold and Jay Gilbert look at the pros and cons of radio promotion for independent artists. Is it going to sell more music? Will it move the dial on a career? Adds and chart positions are great, but what are you hoping to achieve?