My Firestone card started at $600, after 6 months it went to $1200 then after a year went to $2000 and they would not increase it after that no matter what my scores or income (both greatly increased). I ended up closing it last year because of the low limit and every time I go in for a quoted special it ends up being twice as much (I call that the the Jiffy Lube effect). Actually I no longer needed it as I have much better cards now and I use Sams Club for tires (better selection, better prices) which offers zero percent financing on most larger sales too.
It was a useful card, I don't think I ever paid a penny of interest over the 3+ years I had the card between extended financing and paying in full for smaler sales. .
