True Story - I once knew a person who was a fresh graduate and had a Credit Card with almost USD $1000 in outstanding balance. She borrowed roughly USD $400 from her parents to pay for daily expenses; food/transportation etc. Upon getting a entry level job that paid USD $1600 a month, she didn't pay back her family or put most of it to cover the Credit Card. Instead she went shopping and out with friends and had to borrow another USD $300 from her family again. Her 4 months working should be been enough to cover her initial outstanding balance as well save some money for the future but the Credit Card became approximately USD $2000 outstanding and owing her family amount USD $1300.
The credit card industry thrives because of the stupidity of people. I will never be able to fathom how people roll over their credit card debt, even when they know that they are paying such a high rate of interest on them.