I'm not sure "deserve" is the right way to consider it, more like "what is the social value of billionaires?" Or, why isn't the marginal tax rate on $1B+ 100%. I don't have much to offer in the way of an answer, just something I regularly ponder.

Furthermore, and I'd say far more indefensible, what is the social value of billionaires who inherited their net worth. Or, why aren't estate taxes on estates over $1B 100%.