We chase after material goods, but because we habituate to them, getting more stuff doesn't provide lasting satisfaction. Psychologists call this the consumer treadmill. Hyperconsumerism drives manufacturing, carbon emissions, and climate change, so it does lasting damage to the environment.
We're always looking for new stimulation. We can get it "extensively" by acquiring more and more possessions, or "intensively" by enjoying what we already have to a greater degree. Mindfulness promotes stimulation and novelty by making everyday experience more intense.