A sickness perhaps, but not a hobby

I was recently speaking to a friend about hobbies, and she claimed that her hobby was shopping.  When I expressed my doubts that shopping is a legitimate hobby, she attempted to equate it to poker or golf or reading (three of my hobbies), claiming that the pleasure she takes from shopping is no different than the joy that I feel after finishing a good book or making a long putt or winning a hand of poker by means of a well-timed bluff.

I asked my friend if she would have as much fun if she...