Yesterday was National Have a Coke Day and that got me thinking.... whatever happened to RC Cola?  Remember that?  Here's a commercial from back in the 70's to refresh your memory:

As I recall, it kinda tasted like generic store brand coke, but it was good!

According to an article from Mental Floss, the history of RC Cola started with a disagreement:

It was a disagreement with Coca-Cola, in fact, that led a man named Claud Hatcher to develop what would become the Royal Crown Cola Company. Hatcher was a pharmacist and a grocery wholesaler who, along with his father, ran the Hatcher Grocery Company. In the early 1900s, the Hatchers sold a lot of Coca-Cola to their customers—so much, that Claud felt he was entitled to a discount or some sort of commission acknowledging his contribution to the company. The local Coke representative, however, denied the request, knowing full well Coke was the most popular soda in the country and not one to be pushed around by its customers. Frustrated, Hatcher told the representative he’d purchased his last case of Coca-Cola, and vowed to develop his own brand.

According to the article, the ultimate demise of RC Cola was LACK OF MARKETING!!!  If you don't advertise, no one will know about your product.  Ya gotta invest in some good RADIO, yo!