i think at least one of my mutuals is fairly immunocompromised so at high risk and i'm pretty sure several of my mutuals have parents and grandparents they're worried about (and reasonable jobs / savings)
Apparently I didn't like this question, for different reasons than the range of values.
... so I'm going to try and suggest a couple improved versions, which I think wouldn't result in the (predictable and predicted!) wrong-seeming skew toward small numbers.
"Aliens have arrived, will give you (and no one else) exactly one dose of 100% effective vaccine, but they require you to sell it to a rich person and use the money to help the needy... how much do you think you can sell it for?"