This isn't a "gamble." No one would gamble if the house offered these odds. The gamble is NOT getting the vaccine. You're gambling with your life, possibly. And you're much more likely to get a "prize" like death, hospitalization, long COVID, etc if you refuse to get vaccinated. Like tens or even hundreds of thousands of times more likely.
It's gamble, the next booster might be the one that gets you. And you'll need a booster because it only lasts a few months anyhow.