I agree, the reward is neither clear nor consistent to individuals.

It's also worth nothing the sacrifice to be made isn't consistent and is highly subjective to an individual. A single person who moved to a new town and spends months isolated, or a business owner, etc. is making very different sacrifices from a person who's in a stable marriage with a family working a software engineering job.

Personal health, health of friends and family, continued employment, etc.

Having a job, presumably