I didn't ask for them. I have 4 total. Two when I got when I was first starting out. I have two cards which comprise the bulk of my credit (one from American Express and the other Chase), which represent ~50% of that $90k. Both have credit limits around $20-25k.

>but I'm wondering why would anyone want to use their high-interest credit card to borrow even a few tens of thousands?

I don't know, but I'm sure as heck not going to utilize them that much! I am sure the credit issuers wish I did though.

Credit cards may not be high interest as you may think. Depends.

Some credit cards have promotional low or no interest rates for a year or so. You can then balance transfer to another promotional rate card at the end of the year. Also many issuers (Barclaycard, AMEX, Capital One) have low or no interest rates for active duty military.

> why would anyone want to use their high-interest credit card to borrow even a few tens of thousands?

Here are a couple ideas: lawyer fees during a contested divorce and emergency spending from being out of work too long.