With the number of immuno- compromised patients in the word, anything that can help decrease the morbidity and mortality of the flu is worth the cost! If you think there aren't many of those at risk, think again. There are: transplant patients, autoimmune disease patients, including diabetics, CVID patients, other specific antibody deficiencies to name a few!
The vaacine doesn't just protect the one who gets it. It protects the rest of us!