Generally the rewards are huge from the bounty and the airdrops. It is hard to put a number on it, but they are generous. Some hunters have even gave their reviews here too.
I am pretty sure there could be some nice numbers in here.
no shit.
joined many airdrop but they gave me nothing,most of them.
so in conclusion it's not worth joining every airdrops out there.
lately i saw some project offer us $5~$10 airdrop,every project have different perspective regarding this.