The pushbuttons like the Mangusta were produced in limited numbers (381/401?)In my opinion, this in itself will make the car more valuable in the long haul if they are kept unmolested. I have the Hawaii 5-0 pushbutton and my 'goose insured for $60k each through Grundy. I would not consider selling them for anything less than that amount which is how I decided on that number. Anything being offered for sale is only worth what someone is willing to pay for it no matter what it's "estimated" worth is. At the moment, my cars are "priceless" to me. I love driving them and enjoy having them around. Of course the right price offer could put any one of them up for adoption!