As the late David Graeber tells us, the consumerism is a systemic issue; people buy pointless shit because their jobs are so pointless and soul-draining (he calls this spiritual violence) that the only thing they have the energy to do outside of work is buy dumb shit. Relevant excerpt:

In a sense, those critics who claim we are not working a fifteen-hour week because we have chosen consumerism over leisure are not entirely off the mark. They just got the mechanisms wrong. We’re not working harder because we’re spending all our time manufacturing PlayStations and serving one another sushi. Industry is being increasingly robotized, and the real service sector remains flat at roughly 20 percent of overall employment. Instead, it is because we have invented a bizarre sadomasochistic dialectic whereby we feel that pain in the workplace is the only possible justification for our furtive consumer pleasures, and, at the same time, the fact that our jobs thus come to eat up more and more of our waking existence means that we do not have the luxury of—as Kathi Weeks has so concisely put it—“a life,” and that, in turn, means that furtive consumer pleasures are the only ones we have time to afford.