It's difficult to acquire wealth without creating it. The most obvious way is inheritance / gifts, or else crime (fraud, theft). Most wealth is created though, not inherited. E.g., most notable American billionaires (Gates, Buffet, Bezos, ...) of today created most of their wealth. Down the ranks from billionaires we might find more inheritance / less wealth creation, but I suspect that in general you'll find that in mature, open, liberal market economies, wealth is mostly created, not "acquired".

EDIT: Ah yes, rent-seeking is a problem. That was identified by Adam Smith, and it's a problem that's as yet unsolved.