I'm in New Hampshire, and haven't seen one ad on TV or heard one on the radio. I got the shot though.

Influenza doesn't usually kill many people, but it kills some, and the vaccine can probably prevent most of those. (The viruses the shot's for, not the other ones.) The folks who administer the vaccination programs are looking at 'herd health', not necessarily the health of individuals. You vaccinate one person, and not only do they not get sick, but they don't spread the flu to others. You might recover just fine, but the neighbor's baby, the cancer patient, or the elderly family member to whom you pass the virus might not. Usually, heavy marketing is aimed at limiting transmission and numbers of infections, and probably doesn't have a lot to do with making money. The vaccine doesn't cost that much and many people will get it without the ads.