Sustainability and consumerism?

This is an article from a great sustainable urban planning website. It highlights a store in Paris called Merci that sells a mix of high-end furniture and crafts, designer and vintage clothes, and other accoutrements of a bohemian bourgeois lifestyle. All proceeds go to a nonprofit benefiting people in Madagascar. The author believes that such a store represents a possible compromise between consumerism and sustainability. But I wonder if compulsively buying a lot of stuff well beyond our basic needs can ever be compatible with living on a finite planet.