While you're right that median is more useful than mean in this case, it doesn't address the specific issue jltsiren raised, that this kind of statistics tends to exclude luxury goods.

This seems reasonable, as luxury is not related to the cost of 'living'. However doing so they include more-than-necessary-to-live earnings but excludes more-than-necessary-to-live costs.

In other words, if you include Bruce Wayne's income, you should include batmobiles, too!