Thanks, this is about the 5th reloading bench that I've had, and I've always had a low, tight cut carpet on them. Partly "just because", partly because I think it looks more "finished", and partly because it is a soft surface when I'm working on a gun.
However, carpet can be a pain to clean -- there's always spilt powder and shot, brass case trimmings, and occasionally a liquid. I also tie flies on that bench, and dropped hooks or flys can get caught in the carpet.
But mainly because its my bench, and I like the carpet on it.