I tried and failed to sell a PS3 for a profit last week. It sold for 750 dollars. That might sound nice, but I had included four games, which brought it to a retail price of 840 dollars. I also lost money because the shipping was four dollars more than I estimated, and paypal fees and the ebay listing ate into an additional 20 bucks.
I'm not a scalper, I bought the PS3 and decided I didn't want it. In the end though, I would have been happier if I had kept it, but my feedback would have taken a massive hit. Sadly, I don't want a Wii and my 360 is being repaired, so I'm pretty much screwed.