They should just multiply a base rate against the severity level. Say the base rate is ranged so low-severity stuff is $500-1K base but high-severity stuff is $10K base. That would net a researcher ~$88K for this specific bug (8.8 severity).
Like look at CVEs curl dealt with at one point that were just completely bogus and given huge severity ratings to start with.
But honestly if you’re the one proposing a “simple solution” maybe do some research yourself.
It's an off the cuff idea on a nerd forum. Relax buddy.