The answer is in music, hell no, in movies mostly no.

I haven't met anybody who bought a CD with the intention of reselling it. Most people who buy music collect it, so they want to keep it.

Movies are a bit different. I think that the big movie chains might overbuy on rentals in order to get people into the store, and with the knowledge that they can resell their extras down the road. So this might encourage slightly larger sales, but in terms of individuals, again, I don't think that the second hand market convinces anybody to actually buy an original copy.

This question was also asked by the Myth Busters on the Discovery channel, in episode 2 And their discoveries came to the same conclusions as the PEI, that cell phones do not causes explosions, but that static electricity, especially that built up by entering and exiting the vehical while pumping up, was the cause of many gas station fires.