I do but only on a casual basis. That looks like an interesting hobby.
I've had one bike that fit like a glove and was a joy to ride. It was stolen from me. It was a very expensive bike, a semi-gift from a friend, so I don't think I could afford to replace it even if I could find another like it which I can't. I knew the brand and the model number but couldn't find any info nor pics of any bike quite like it.
Are you good at identifying bikes?