MCNTalk has long taken on the vaccination story and has advocated rational and life saving public health policies that promote vaccination.
As this article demonstrates, the dark side of vaccinations is not the overstated risk of side effects, but the predatory cost escalation. The short answer to why the manufacturers are driving up prices is because they can.
This is further enabled by the requirements that some vaccinations be administered for school admission and other public good.
Also the lack of marketplace pressures since the cost is generally borne by government and insurance carriers promotes insensitivity and indifference among those who benefit from them. Finally, monopolies granted via patents and regulations do nothing to induce competition among manufacturers.