Gratitude and materialism tend to pull attention in opposite directions, almost as a matter of habit. Materialism keeps attention fixed on what is still missing, the next purchase, the next upgrade, while gratitude directs attention toward what is already present and already sufficient, even if only for the brief moment currently being noticed.
This is not an argument against ever wanting anything new, but a gratitude practice does seem to quietly reduce the intensity of that wanting, since a mind that regularly registers sufficiency has less room left for the sense of lack that drives a great deal of consumer spending.
People who practise gratitude consistently tend to report less concern with status and possessions relative to those who do not, which suggests the practice is not merely a pleasant addition to a materialistic life but a genuine, quiet counterweight to it, one that seems to hold up even under real financial pressure.