was when a woman I knew that owed a knick-nack/home decor/antique store would regularly make the rounds of all the DI stores in the valley, buying items that she could mark up significantly and resell in her store. I thought that was kind of lame.

I have also seen people browsing through the used books at DI with an ISBN scanner to find the ones that have decent resale value. Again, nothing against the rules, but kind of lame, IMO.