I've seen people in incredibly poor countries do amazing things with leftover garbage. Plastic water bottles as sandals, shoe soles as door hinges, etc. Just like with not saving for retirement, infidelity, over eating, and accumulating warehouses full of stuff, humans now find themselves in a position where they are fighting their animalistic instincts. And just like having self-discipline for the activities above, accumulating stuff will make you miserable as well.
Buying stuff, culinary gluttony, sexual infidelity, and spending all that you make will bring you random moments of 'happiness', but it's no way to achieve long-term contentment. DON'T BE MODERN SOCIETY'S BITCHES!!!