I don't think bounty hunters are always after for higher rewards because it's impossible to predict the future that joining specific bounty campaign and always getting higher rewards than the other.
For me, earning around $1,000 more or less is better than earning nothing.
but the figure on this thread shows generous partition but I don't think every ICO are offering high allocation rewards for it's bounty campaign participants.
I think they know what deserves for us in return of helping them on promoting their ICO to the public.