Its ridiculous when you say about the lambo things, the point is not for being more consumptive to save the planets, not the contrary. The millennial should concern about long time-simple living, being more spiritual, understand about their self and be more environmentalist, not those who party everyday and spend those money to buy shit product.
you are right, no matter how much money we have if our lifestyle is too luxurious I think it will never be enough.
simple life is good, because I think money is not a guarantee of a happy life, there are things that are more valuable than money.