Did anyone hear the previous Duke of Westminster's answer on radio as to how his family acquired their wealth? He was very honest about.
"Basically, the Duke of Normandy (whose great great grandfather pillaged France to such an extent that the Holy Roman Emperor gave him Normandy to sate his appetite), invaded the country, took everything as his own, gave some to the church and some to his mates who helped his conquest. And my ancestor was such a mate. And we've invested very wisely since. "
We are still living with the legacy.
The hereditary bit counts for nothing. The Glorious Revolution was essentially a change of monarchy, legitimised with the link that the new were cousins of the old. That was the end of the divine right to rule.