Maintaining debt, to build a credit score, to apply for further debt is, in itself, a silly cycle. However, it's the American Way...
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But as long as you're efficient at paying cards off each month you aren't really accruing debt, you're just waiting a month to pay for today's purchase. The only way I was able to obtain a house and a car was having a good credit rating which was built up by using and paying off cards and other bills and not owing anything. I never had any student loans(thanks, Dad) so I wasn't able to do it like you did but I see how you're doing it.