I always spend a few minutes comparing copies of the same film for marks, tears, etc. on the slipcover. If I'm paying for it, I want it in the best condition possible, and I want it to last.
I thought I was the only one in the world who does this!!
I feel really self-conscious about it, but I check for the most perfectly undamaged copy of anything I buy of this sort -- Blu-rays, DVDs, books, clothing. I can't just pick the first one of the shelf and buy it, I have to check that there are no nicks, tears, bashes, bends, or other anomalies. I too like to treat my stuff well, and like to get a good start by buying one that's perfectly unmarred.