We could '60s TV Batman old school on this.
"Holy Crumbling Infrastructure Batman!"
"That's right Robin. Other than one you know (ahem) fairly well, Gotham's billionaires are a murder of self-centered, money-worshipping soulless dickweeds."
"A murder, Batman?"
"Yes, Robin, like a murder of crows. Crows, like rats, live and feed off the good work of others, neither asking permission or giving thanks. Left unchecked, they can pick an area so clean it will be barren for generations. 'Murder' is quite the correct term for a congregation of such rapacious feathered beasts, wouldn't you say Robin?"
"But Batman, how do we get rid of them?"
"We don't Robin. Soulless as these billionaires are, they are still God's creatures. No, the best we can do is keep them in check. Protect the good citizens of Gotham from their rapaciousness by making them do the one thing crows don't do."
"But Batman, how do we do that?"
"Taxes, my comrade in fighting the evil that plagues our fair city. Taxes."