Simply put, poor people buy for style and cool while rich people buy for quality, utility and prestige.
This goes back to how to treat money in life, in the sense that poor people are not not allowed to buy expensive goods and indulge in what the rich do, only they do not have enough to live much longer but they force it to fulfill their desires not their needs.

The use of money can indeed show the nature that someone has a rich or poor mentality, this does not only happen to the poor, but not a few rich people whose wealth is not the result of their efforts have a bad mentality of use.