In the "Wii Sports Passes SMB for the best selling game of all time" thread, Snozzle mentioned that Wii Sports was selling for $40+ on ebay and Amazon. I was a bit suspicious of that since it seemed really high for a game that all Wii owners (in NA) should have. Lo and behold, it's true:EBay Listings for Wii Sports !
A few things come to mind when seeing this:
1. Most people are probably not selling their copies, unlike other Wii games. If they were, it would drive the price down.
2. People perceive Wii Sports as having a high value, otherwise there wouldn't be bidders to drive up the price of copies for sale.
In any case, I find it really interesting and it certainly shows that the demand for Wii Sports would most likely have been very high if Nintendo hadn't bundled it (as in Japan).