I'm not so sure one can say the ability increase your footprint due to wealth directly equates to a larger footprint... A bit of an anecdotal counterpoint: the few wealthy folks I know are almost hermits and typically relax at home while the rest of us have daily commutes and such. I've never known them to fly anywhere and basically "have everything they need" where they are. I'd be willing to bet their carbon footprint is much much lower than most.