> Thats >10 weeks of protection at no monetary cost to you.

monetary costs are not the only costs you pay

When I took the vaccine I was sick for a few days. I don't have any risk factors. I have multiple double vaxxed and non-vaxxed family members for whom covid was a minor cold and none for whom it was serious. I assume that as I am genetically closest to my family members they are a good predictor for how I will fare, if I haven't already had it without knowing it.

Why would I sicken myself for a few days with the next vaccine shot to marginally decrease the odds I will be sick for a few days from covid?

The benefits are always balanced against the potential harm.

For young males, the risk of myocarditis from the vaccine may be comparable to that from the disease according to a UK study - until that’s clarified, booster mandates have no place in colleges.

The cost is potential health risks associated with taking the vaccine/booster. We don't know exactly why myocarditis rates are elevated and some people would rather wait for more information.