I like to buy old mix cds at garage sales. I love music, so there's that. But even more it gives you a glimpse into someone elses's joys and sorrows. One of our favorites was one called "Ladies Night." I have no idea who made them but sometimes I can can guess when. I guess I have a big stack I need to unload, too.  

I would keep your other CDs. I had to sell hundreds of CDs back in a food vs. music stage of my life about 5 years ago. I miss many of them and find myself rifling through CD bins looking for them, like old lost loves.