Depending on your shopping patterns and your discipline with paying cards off monthly I would agree with webdoyenne in her comment how certain cards can be worth it. Her example of course being Target — she consistently saves 5% and they donate money to her son’s high school. Pretty great deal in certain situations.
That said I would agree that for the most part you’re much better off not having a store credit card. I do have ONE and as you said it has a super high interest rate (around 23% if I remember correctly). However the card I have also offers 0% financing quite often so I took advantage of it once to buy myself a new flat screen 
I’m a sucker for new gadgets (my one weakness, other than that I’m pretty stingy with my money )
