Advertising in any medium may or may not work. It all depends on what you run, where you run it, and what you hope to get out of it. It's all a waste of money if your ads don't work.
A TV spot
might work but only if you can produce an effective ad and buy sufficient time on the right networks. Repetition is important for tv unless you're buying local time during a big programming event.
TV may actually be effective for your shop because of the local demos: Hendersonville has a population of 13,000 with low population density and a relatively low median income (compared to national average). I'm guessing you have to pull in customers from the surrounding area, which may make outdoor advertising difficult unless you can get prime, high-traffic locations.
A better use of electronic media for you may be radio. Cheaper than TV and easier to buy space during prime hours. Also, radio stations do tons of events and promotions. Having Vespas at big local events, concerts, festivals or whatever would probably go a long way. Or have an event at your shop ("The K101 Rock Bus is stopping at Moto Nexus!!!"). Free omn-air advertising!
One of the best (and only) scooter ad placements I've seen in this area was in the placards on top of gas pumps. If you could target stations in the more affluent areas of the county, that could be really cool.
Hope you don't mind my saying, but... You could also be making more effective use of your web site. There's almost no scooter content at all. The blog/news is all motorcycle and racing. Consider a totally separate site for you scooter business. I really like what
Vespa Lexington does: nothing fancy, a straight up blog, but fun to read and helps build community through contests, posting pics of new owners and their rides, communicating with the local riders via Twitter, etc. Also, having a dedicated site with frequent posts will help with your search engine ranks. Google "vespa north carolina" and your site doesn't show up in the first 4 pages. Some of your competition in other cities-which aren't that far-do.