Please read:
http://originaltrilogy.com/forum/topic.cfm/Notes-on-Piracy-Please-Read/forum/17/topic/13347/
If you buy used copies, Lucasfilm won't see it as a sale of their crap offering. Also, damaged discs may be available at a discount for those who have no intention of ever watching them. I've found that gluing all of the Blu-rays together and throwing away the cases allows them to take up less room.