I don't earn money to pretend to be poor
Whilst the point may have been missed, it does perhaps highlight a good point. It is probably easier to do this if you are affluent in the first place, Vimes boot theory springs to mind. It is easy to not have to replace your boots that cost $50 dollars that last 10 years, then the $10 dollar pair that last less than 2 years and are already on their last legs.
Most people could reduce unnecessary and frivolous spending but no spending at all, will, on the whole, be limited to those who already have everything and in good working order (and likely to remain so)