Clever idea, but I doubt this would work in 99% of cases.
It's basically a link to an EXE. You could probably only convince someone to run it if you have some acquaintance with them, so obviously they'd hate you afterwards. And you only get the key if they not only get infected, but pay up. And you have to do it twice.
A better method might be "get 5 people infected", regardless of payment.