I'm on medication that reduces my immune system. It isn't reduced to nothing (unless I ingest the medication directly), but the medication is intended to suppresses some of my immune system. I also have relatives that are on more fully immunosuppressant drugs (after an organ transplant) and relatives that have most of the underlying risk factors that make them likely to be hospitalized (or worse).
What am I trying to achieve? (1) Since my immune system is weakened, to give it the best shot that I can. (2) Reduce the amount of virus I spread to those relatives. Vaccines are proven to be helpful with both of those. Are vaccines 100% effective at fully eliminating all problems? Certainly not. But they both reduce the incidents of transmission and reduce the severity of the disease when transmission does occur. And since the vaccine effectiveness starts dwindling around the 3-month mark, annual vaccinations leaves ~9 months of higher risk.
What are you trying to achieve by arguing against my ability to get a mid-year vaccine?
As for the rest of your post, the US Federal government no longer buys vaccines for the general public. That ended more than 4 months ago. It still buys it for federal workers, vets, etc like any other vaccine though (just not for the general public).
https://www.cdc.gov/vaccines/covid-19/vaccination-provider-support.html