They are still paying nowhere near the same portion of their income as those of less advantage are paying. Plus their disposable income is still vastly larger,

They are still paying nowhere near the same portion of their income as those of less advantage are paying. Plus their disposable income is still vastly larger, and they're basically untouched by the regressive costs paid by less fortunate people. The wealthy should pay more, that is why progressive tax systems exist. They reap the largest benefit of society's goods, by a gigantic margin.