I don't think the problem is billionaires but the fact that economic power easily become political power and grows in a positive feedback loop. Billionaires are a symptom but the problem is a pathological social system.
And a big part of this is people seeking for wealth, social status, visibility etc even at the lowest possible level of the pyramid.
I think a better advice is giving less importance to the narrative that everyone creates about themselves and give it to the really important things in life, including being morally upright and principled, even if no one will ever know, even if no one appreciates you, even if that means sacrificing wealth.