but those that mainly take care about the underlying network that keeps bitcoin working are volunteers.
sorry had to correct something, the main coders are paid by blockstream
gmaxwell
lukejr
carolla
peter Wuille
there are about 13 coders.. which give blockstream alot of veto power over what final code gets to be released.
if you think that blockstream is just adam back and he is using the $55 all to himself. then please research more