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Why do credit cards require a minimum annual household income?
It is much simpler than any of that.  People who make money have a greater capacity to pay their bills.  Credit card companies make money off of people who can afford to pay several hundred dollars a month in interest charges.  If you only make 500 a month you can not afford to pay 200 in interest.  So their cost of doing business with you is higher.  These cards are issued to make money.  And they make their money off of people paying 12-29% interest on their 5k+ credit limits they have nearly maxed.