I wouldn't be able to sleep at night if I owed that much. We have a bit - about $1,500 between 2 cards (his and hers).
I had cards for department stores with a zero balance, but when we went to renegotiate our mortgage I found out that even if you owe nothing, whatever the limit on that card is is considered debt to the bank or loaning institution since you could go out tomorrow and run the card up to the max. In other words, I had a Bay card, Sears, Eatons each with a $2,000 limit so the bank considered me to have $6,000 debt even though the balance on each was zero.
I cancelled and cut up every card and now only have one Visa and my husband has his own Visa - and ONLY for emergencies. That's it! And our mortgage is paid up in 10 months! Yay!