I have no idea what it cost you. If it was free to you, that means someone else paid. If you don't mind a needle in the arm, you didn't pay that price.That fails for the same reason Pascal's wager fails. Being religious doesn't cost you nothing. In fact, it is often time-consuming and expensive and boring.
I doubt I will get a second booster anytime soon, I'm not convinced it is necessary. I will get an annual flu shot later in the year.
I got a second booster because I'm not convinced it is not necessary. Maybe we should adjust Pascal's wager to something meaningful: You should get it because if you needed it will prevent premature death or long Covid and if you didn't need it it cost nothing.
What exactly did the booster cost me? (Not time. My wife gave it to me when I picked her up for dinner.)
Why on earth do you think your subjective evaluation of something is everyone else's?