Wise Investment?

So two weeks ago my friend told me he had two xbox 360 preorders, but couldnt afford to buy both of them, so he offered me one. I told him "sure" and we went and picked it up the night they were released. I pulled it out and played around a little bit, but wasnt all that impressed with the selection of games available (but the graphics are pretty good) so I decided to put it up on ebay. This morning it just sold for...wait for it.....$935!!! I paid $450 for the premium system plus one game! So yeah, hows that for investing?