You are right. JK Rowling of harry potter comes to my mind when I read your comment ... In one of her commencement speeches she will draw attention to this exact same point ...
But then again, we will never know about extremely creative yet poor people who are struggling to make ends meet and wasting their precious mental energy on things others take for granted.
But that does not discredit the original point (to which I was agreeing), that being poor is not an impediment to creativity.