Something Also

I totally understand that new books become "used" books and get passed along and sold through websites, etc. But what I don't understand is something like this. How can somebody sell that book for 42 bucks? Some people are selling it for $2.59. New, it cost 14.95. I just can't get how somebody in Vermont who has a copy with "light wear to one cover corner" can do this. I'm trying, but I feel stupid.