Because we live in a capitalistic society where supply/demand ultimately controls price, not what's fair.
I.e. On average, engineers get paid what they do because if they demand any more, another peer of equal caliber, on average, will take their job. VC's get paid, on average, what they do because no other VC will do it for less.
I.e. On average, engineers get paid what they do because if they demand any more, another peer of equal caliber, on average, will take their job. VC's get paid, on average, what they do because no other VC will do it for less.