I'm sure drug dealers and terrorists in North America spend their time burning movies and music to sell.
at the potential markup of burned DVDs/CDs... why not. 100 pack of CDR's at walmart for $40, some label-printing crap, a few $29 newegg DVD burners, and long night of swapping CDs/DVDs... bam, $0.75 worth of material for $10-15 worth of product.
though, to be serious, It takes a special kind of retard to sell burned/copied DVDs in a public place, such as a fair or convention. Im assuming its the same category of idiot that also holds up a 7/11. And, from what ive seen (not much, but..), people who steal car radios and steal from stores, arnt the type of people that limit themselves to one "profession".