During the 1980's- 90's VHS Boom lesser known movies would do anything they could to jump out at you and say HEY RENT ME!!! Big Boxes, Clamshells were a good way of doing so due to the bigger covers and often great art work you couldnt help but look at them so movies went even further then that to get noticed. Light up boxes, talking boxes, bleeding boxes, 3D covers, Halographics they tried it all and alot of them looked really cool lets take a look at some of the great gimmicks.
One of the chances I take buying used dvds at the SA/GW (or anywhere, really). No chance to return it or exchange it there. And buying privately could have the same issue, or if you can return/exchange, it becomes a hassle.
I bought a book off the Amazon Marketplace thinking it was New - Mint. When I got it, spine was F'ed up royally, a rip in the back cover and beds all along the front. That sure as hell ain't shelf wear. I had to fight with the guy to get half my money back because I didn't want to go through the hassle of sending it back (the closest post office is 2 buses away),