That falls right into my "Mr. Rogers vs Adolf Hitler" dichotomy example. A billion dollars is so extreme that we both agree on that, and I expect a large number of other people would also agree. Ten dollars is so extreme on the other end of the spectrum that I can predict with very high confidence that we both agree there, too. And when you're somewhere in the middle, clearly more than average, clearly in the realm of luxury and surplus, then there's going to be higher levels of disagreement.
That's why it's important to have these discussions, because reasonable people can disagree, but for a properly functional society, we need to find out where we do (mostly) agree, so that we can all move forward together through thoughtful compromise.