They should be able to give half of it to family members and friends who aren't rich. Sort of a real trickle down. The point is that they can't keep anymore than the cap or ceiling and when said family or friends reach the cap they have to do the same so it spreads around the populace. I have thought about this a lot and think it's more in our nature to live this way. After all in functioning hunter and gatherer societies, the able bodied men and women hunt and gather. They bring it all back to the village to share with everyone, the children, the elderly and the handicapped.