Dave, I can tell you from a few I have seen that a lot of people sell because they build a car totally unsuited to the real intended purpose! They put in a suspension that will knock fillings out of your teeth, and stuff a motor in that can't idle, gets 2 MPG and runs like crap at anything below 5000 rpm! Now a car like that is fine, IF that's what you really want! I think most people really want a street car, and a Cobra with any decent engine will fill that bill in spades. If you plan rationally, you can have a car that will go like greased lightning, and be virtually maintenance free. Second, a lot of people love to 'tinker'. Always looking for the next horsepower tweak, or visual cue. After awhile, they are bound to change cars when they run outta stuff to do! Lastly, and unfortunately, there is always the 'downturn' financially. When that happens sometimes it's hard to justify the expensive toys. Same reason so many boats, luxury cars and expensive homes hit the market in bad times.
