Sometimes an idea is so stupid that there's nothing really to say. "Billionaires are billionaires because they care about their cost of living"? It is just demonstrably untrue. Which is why we see billionaires with megayachts, penthouse suites, private jets, private islands, obscure car collections, etc.
Billionaires are billionaires because they've made amazing investments or have created companies or products worth billions. That's it. It has nothing to do with how they deal with their cost of living.