Ok, but if that's really the definition we're using, there's a pretty enormous gap between "not price sensitive about food* and "not price sensitive about travel", so much so that most very rich people are in the middle; after all, even very reach people occasionally fly commercial, or fractional-ownership a private jet.
Hotels run up the scale to 67,000+$ a night. That's the tipping point for not caring about travel costs not simply bounding your costs by a hidden 'within my price range' scale. Interest on 1 billion will cover a 70k / night hotel room for the rest of your life it's simply not important.