Depends on the person. Paul has at least 3 that I know of. I have more than that. Some of my friends only have 1 and don't care to have another.

It all has to do with how paranoid you are about it getting stolen or damaged. Other factors include dedicating one or more for home/office use. Perhaps someone has more than one car and would rather have two empegs instead of one empeg and two sleds.