I tend to open everything, but carefully and save the boxes, unless its a duplicate, which I dont open or try and sell if I got it for a good discountt. but I never rip into anything and I like to try everything out or whats the point? Especially don't like the fact that if you open something years after the purchase and there's a defect/problem with it, you have little to no recourse with your seller and have to go warranty route if it applies.
I once bought a Pink Floyd dvd called pulse, let it sit for a year, by the time I viewed it I found out it had a surface defect and couldn't be played, so I was screwed and had to buy another