Great concept - love all 4 locations. I have cleaned out my closet and sold multiple items to the store. I think people have to be prepared for the low cash offer, I mean after all they are accepting your "junk" and selling it for a low price. We all benefit in the end.
Also - all my items the accepted were either in new condition with tags are looks very new with no damage or stains.
My recommendation is to drop by early in the day so the SA has time to look through your things, keep an open mind on what they want to buy and be open to donating the rest of your items to charity!