Most come from well to do circumstances, anywhere from Aurelius to Weil, they were birthed into apposite economic strata, with enough 'wisdom' to ameliorate themselves in childhood from extreme rending poverty, and later on with that basis formulated such austere philosophies. Name me one truly unfathomable poverty stricken philosopher, think subsaharan famine levels, especially in their formative years, and I'll list you thousands of counter examples.