The comments about folk buying stuff and then offloading it unopened/unused sort of reminds me of a conversation with an American chap who came over here for a couple of years (USAF).
He said his brother was an investment banker but gave it all up because he realised there was more money to be made by sourcing iMacs, iPads, iPods etc that people bought just to say that they had one. They were rarely opened and practically always unused.
He ran ads in local papers all over the US and paid scrap prices (because a new version had come out and ergo, the old stuff was crap now) then promptly resold them on ebay. He loves Apple launching new stuff because it always ended up in his getting a new source of goods.
At uni I only ever shopped in charity shops for clothes etc. Buy lots of s/h books now.