I actually thought it was worth closer to $15K considering the rate for just the case, card, and book:
http://www.ebay.com/itm/TurboGrafx-1...item41992980ce
Again, I've seen them go for as much as $25K new and sealed, but that was a number of years ago. Magical Chase is pretty darned rare. It's rare I see U.S. copies on ebay at all, and they're never at an attainable rate.
I almost owned this game once... Got out voted and we bought Motoroader instead... It's a bit of a sore spot these days. I would have never sold it, but I would have liked to own it.