I'm like Willferg. There's often one or two things I like, but mostly I look but don't buy. I don't ever buy fabric for two reasons.
1. I have loads of allergies & sometimes can't even stand just to have it in the car with me on the ride home or touching it long enough to put it in the washer.
2. Usually by me the fabrics are already bagged up so I can't actually see what I'm buying. Most often, they are lots of JAF/HL clearance fabrics from 10 years ago. I'm not any more enamored with them than the seller was when she decided to get rid of them. Yes, that means that every so often I miss out on a really amazing deal, but it's just not worth it to me to buy 9 bags of junk fabric in the hopes that bag number 10 will be some incredible find.
If anything, I usually buy the same kinds of stuff I'd buy at HL/JAF at guild/rummage sales: tools, notions, & organizers.