Given that the majority of wealth is inherited, how smart you are doesn't need to be related at all.
Do you have any sources that I could additionally review to support the majority claim?
https://www.famcap.com/2016/05/2016-5-17-wealthspike-europe-...
Edit: there has also been the absolutism movement which effectively removed control from large fractions of lower nobility over their lands, requiring them to be in the royal palace. There was also the german mediatization at the start of the 19th century where the holdings of lower noble families got integrated into larger units. Those larger units, as well as their holdings, then got turned into democracies in the 20th century.
There isn't enough old wealth for this to even be possibly true.