Credit card companies are a scam, and so is college, unless you're one of the exceptional. They often work hand in hand too, giving credit cards out to students whom they know need "money", so when the students finally graduate they have both massive student loans and credit card debt; unless they were fortunate enough to find a good part or even full time job during classes to help keep it down.
If credit card companies weren't crooked, they'd be more accurate as far as how much they'll let you borrow based on your income. Obviously they're letting people borrow too much if so many end up getting in over their heads, add-on interest rates, etc. Granted it's up to the person not to spend that much in the first place but in some cases many people don't have that luxury at a given stage in life.
I worked night shift almost full time during a year of school, part time otherwise and still have $20,000 student loans, $6,000 left of car payments, and an equal amount of CC debt. It's manageable but I still am a ways from having a career that I find both financially and personally satisfying. I never cared about the money as much as doing something I enjoyed getting up in the am for. Ironically the importance of money was preached to me all the while I was growing up too.