My friend told me he has about $5000 on a credit card with no incurring interest because he did a balance transfer previously. He has about $4000 in savings earning 6% and can pay off this credit card by next month when the balance transfer period ends.
However, he said he was thinking about just transferring the debt to a new credit card via a 0% interest balance transfer and paying the minimum, and to keep on doing this so that he earns interest instead of paying interest.
I told him he was better off to just pay it off next month, but he asked why, when he could earn interest instead of paying interest. I think I was coming from a 'moral' point of view, whereas he seemed to make a good financial point.