The pediatrician makes a lot more then $0.25/vaccine. Vaccines and the related visits that go hand in hand with the vaccine schedule makes up the majority of pediatrician's income. So there may not be too much money made on the manufacturer's side but distribution there is plenty.
Also with vaccines being immune from lawsuits that decreases the risk that the manufacturers have for any losses. So that smaller profit is almost a guaranteed profit.
Being immune from lawsuits might have something to do with local liability laws. Imagine, every child gets vaccinated and the local population has a love for litigation, as a manufacturer I would not like to spend my profits on lawyers; court cases etc. I would choose to leave the business of developing/manufacturing vaccines and go into the foot cream business (lower risk, higher reward). In the end when almost every private company but one has left price of a vaccine might be equal to a new Lexus. The other option would be for the government to start manufacturing vaccines but I believe this is the ultimate nightmare for a certain group of people...
The lack of ability to sue makes vaccines inherently more dangerous. There is no incentive to make a safe product.
Compound that with the fact that most vaccines are directed at infants which means it is that much harder to detect a vaccine injury since they can't tell you how they feel and you get a increasingly hazardous environment to grow up in.
The thing that governments falsely believe is that the cost of the vaccine out weighs the cost of treating the acute illness. But if you take into account the extra burden of chronic illness that vaccines set your immune system up for that excuses doess't hold up.
Governments absolutely should be the ones producing vaccines. they are already the ones footing the bill for current vaccine injuries why let private companies profit off of it. The only reason that governments are still pushing vaccines is that they feel that they are in too deep to reverse that decision from a litigation point of view and they are way too short sighted in their thinking to see the cost savings to the healthcare system over the longterm if we no longer pushed vaccines on everyone and rather respected the wishes of parents to make decisions for the health of their families themselves.