Your child can die from chickenpox.
Physicians who care for adults generally don't think about vaccines as much as pediatricians do, and adults think of vaccines as a kid thing.
Flu vaccine is far and away the most underutilized.
Pneumococcus is a fairly common cause of pneumonia and [raises the] risk of death in older adults.
The flu can definitely set you up for bacterial pneumonias.
Vaccines are not traditionally big money makers. They're given once or a few times in one's life, so they're never going to be blockbusters.