Not to mention scratch resistant technology has improved to the extant that i'm less worried about my dvd being so scratched when i rent, or used-buy that it won't work.
I have always been the collector type, so i would rather have a huge library of media than give it away. Philosophically, i think it would be better if i wasn't the only purchaser, and that i shared what i had with a larger group. Something like that in the long run would hurt the crap out of the industry. If i can share something with someone they can share something with me, there would be no duplicates and no waste.