Same here - I have a set that hangs in my garage. I put them on a car maybe once or twice a year.
About 5 years ago I told my brother his factory roof racks were costing him 3-4% a year extra in fuel costs. They're still on. I've seen him use them twice.
Here's something new though: roof racks have become / are becoming a fashion accessory on the hip younguns' vehicles. I'm seeing more and more empty ones on lowered/stanced cars that are all stickerbombed, like this:
