This time last year I had nothing but sub-prime cards and Orchard had just ratejacked me to 29.99%. I've been able to tell them all to go sit and spin now that I have such cards as a $10K chase and a $15K Amex Blue.
I do have one card left from my sub-prime days, Wells Fargo Financial. But I paid them on time for a year (at 23.24% APR) and threatened to cancel. They permanently waived the AF and dropped the APR 11 POINTS. That card is now at a 0 balance and it is the lowest permanent APR of any card I have.
Sub-Prime is kind of like training wheels on a bike - there is nothing like the satisfaction of taking them off and moving ahead!