I heard a statistic from the mouth of the head of the Pasteur Institute (yes, I know a Frenchman, but still highly reputable) who said that only 2.5% of the entire market pharmaceutical market are vaccines. Correspondingly only around that percentage gets spent on R&D.
Consdering the extremely high cost-benefit of vaccines for society, this is a real problem with the market and a place where government intervention is called for.
By comparison, Viagra makes up 1.25% of the total pharmaceutical market.
Methinks our priorities are a bit skewed.
Then start a drug company (or buy shares in one with priorities you agree with).
Uh, government has already intervened - with disastrous results. The vaccine makers were doing fine until Hillary tried to force them to sell their vaccines for at or below cost, using the purchasing power of government. Since no business is sane enough to sell their products for a loss, the drug companies just stopped producing the vaccines. Try reading Atlas Shrugged sometime.