My long-deceased aunt’s second marriage was to a wealthy Texas oilman (and other lucrative business ventures across the country and world) who lived modestly. He often rode a bike around town and his clothes were whatever he threw on that morning. You would never describe him as a man of fashion or taste. He enjoyed his money but in a quiet way that didn't draw attention. He died at a relatively young age and his children by his first marriage (his first wife died from cancer) lived large, lavishly spending their inheritance.