We share some similar thoughts. I don't put my kids on vaccinations for every year's flu vaccinations promoted by the government. However, I did follow the suggestions of doctors to vaccinate them according to the tracks for new born babies and infants (up to 4 years old).
The reason behind is that vaccination for new born babies are basically the same things over last decades, so they are proven and not changing every year. You won't feel like gambling.
But for the seasonal flu vaccination? As per the information given by various sources, it is nothing more than a wild guess from the manufacturers towards what's going to happen this year and press the button of their production line. They work with our government to get rid of their stocks, no guarantee on what produced can actually fight the flu happening at that time.
Therefore, I decided to allow my kids to tackle the flu all by themselves.