Being poor in general, during your childhood, scars you for life. It makes you penny wise and pound foolish, adverse to taking risks in your career and investments, can destroy your confidence in yourself, while always having to look over your shoulder monetarily speaking. Habits that even after you remove poverty from your live, you still feel the the anxiety and triggers in your head.
You could also say being poor in childhood teaches you how to be frugal. I regard this as a healthy habit and better discipline I wish I had with money (coming from a middle-class family).
Another way to look at frugality is just an aversion to spending money on whatever it is that society or mass media tell you you have to buy, an important and healthy attitude one can have, IMO.