People are over-moralizing this. Why do CEOs get paid so much? Why are salesmen often better paid than engineers? Does a ditch-digger deserve less money than a lawyer? The market is basically amoral. People get what they can get, not what they 'deserve'. Founders get more money because they have ownership, and in a capitalistic system profits accrue to capital. There's no point in constructing an elaborate moral arch…
Personally, I'm of the opinion that no job worth doing is worth less than any other job, but I recognise there's “some” ways to go before that thought becomes in any way mainstream again…