The main reason why poor people buy expensive stuff is because they want good things too. And they would buy the things they desire at the first available opportunity. They want to be happy, they want to fulfill their fancies and dreams. It is mostly about them than the environment. Take for example, a person may fancy and dream of owning a certain gaming laptop, and even though money is hard to come by, when they are able to raise the required money, they’ll buy it immediately as opposed to investing because nothing is easy, even investing is difficult and doesn’t guarantee returns on said investment. We as poor people would rather enjoy the small joys our little money can immediately afford us, than prolong our inner suffering by trying to find answers to the difficult problem that is poverty.