I can't recall a time that I have heard a radio or seen a TV ad for an electric motorcycle. But if any manufacturer decides to promote their products to existing IC owners via the enthusiast media or over the air, I think I have an approach that will work: Today I heard an ad for Indian motorcycles on the radio specifically aimed at Harley owners. It asked them to add an ($20K+) Indian to their collection of Harley motorcycles. Sounds like they know their potential customers.
To me it would make a lot more sense to add an electric motorcycle to an IC owner's garage and make a point that it would be perfect for shorter trips and save the cruiser for the big trip to Sturgis each year. That would cut down on both wear and tear on the IC bike, as well as cleaning all of the chrome every time it is ridden. No chrome on Zeros and Brammos and that really cuts down on the time cleaning the bike - leaving you more time to clean and polish the Harley or Indian.