Think of your credit card as an adjustable rate loan. EXACTLY what put the economy in the deep recession its in now with the housing market. What it comes down to is good ol' American greed. The credit card companies wanting to make more money by giving everyone who can read/write a card with a $5000 limit, then playing with interest rates to maximize profit. When others can't pay their card off, NO PROBLEM! Just bump up the rates of those who do pay off their cards to make up for it.
I've never been a fan of credit, or spending money you don't have. I only have cards to boost up my credit rating. The good credit rating is the key to a lot of things in this country. A house will probably be the only thing I ever pay interest on.
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