I was just thinking. I am about to celebrate my 26th birthday. Ive been collecting DVDs now for about 5 years. I have replaced many VHS tapes that my parents bought when I was younger, so we can reasonably say I am on my 2nd generation of home video. Lets say I replaced my entire library (or at least the good movies ) each time a new format came out. How many times do you think I will have bought the same movie by the time I am 75 or something? Once every 5 years, 10..20? What do you all think?