i think its a little overpriced, but its a car to buy and use maybe 1-2k miles per year. to keep its value you would have to clean it, clean it and not modify it at all.
i gave strong money for my 4i in 2007, but the value was slashed when it was damaged by a thief and then again when my garage was broken into. original parts are hard to find, but even more significant is body damage. original panel and paint is so desireable.