Hmm... I checked two boxes on the survey. The answer to this really depends on which book you are talking about. Esty can testify from my multiple overcrowded bookcases that I go a little crazy with book buying and have various editions of many titles. I especially collect hobbits.....books, I mean,.... not real ones.
My first Hobbit and LotR were paperbacks I bought at the local bookstore when I was in my teens, both the dreaded Ace and the official Ballentines. My family has acknowledged my addiction to Tolkien in recent years, and have generously helped fund my "habit" on gift giving occasions. Even my kids have scrounged on e-bay to buy mom copies of Mr. Bliss, Roverandum, Father Christmas letters, etc.
Lalwende - I wouldn't be surprised if we have unknowingly bid against each other on e-bay, although I am trying to be good and resist too much expenditure at the present moment. I am also a big fan of library sales and have picked up some real bargains.