Early in my quilting life I bought a few because of price. I wasn’t expecting new releases or popular fabrics but I love scrap quilts and at the time I didn’t have near enough variety. They weren’t totally random....all Tula or all Kaffe for example. Some duds included in most packs and it is amazing how challenging it is to use up a even a fat quarter when you don’t like it! I used quite a few to practice FMQ, some for zipper bags and some for experimenting with new techniques.
the ones I had great success with were all batik mystery bundles and for the right price I wouldn’t hesitate to purchase more of those. It is unlikely I will purchase non batik mystery bundles again, too many large prints and novelty type prints.