A lot of people from the early days remember the downward pricing mania that was heavily influenced by Centerpunch's site. I never really got on board with the methodology of fordgtprices.com because I don't think eBay auctions, completed or otherwise, are a particularly precise gauge of what is really happening in the exotic car market. That's not to say it wasn't accurate as far as the general trend, because it certainly was. Near the end of production, GT prices were soft and getting softer. A lot of people paid well below MSRP. There's no question that dealers were presented with a list of prices from that site, said "oh damn!" and sold the car for cheaper than they otherwise might have. A number of people posted as much at the time and they should have been cutting Paul commission checks for it. As prices continued to decline and the price floor was a topic of discussion, a lot of owners tried to and did unload before they dropped further.
Fast forward to now, and I think Auction Mania, with an assist from collector car mag analysis, is doing the reverse. There's this drumbeat that the GT is inexorably on the march towards $1 mil within a decade. While the GT is certainly about as certain a bet to go up long term as you can get with a car, the prices for certain variants have already gone up a comical amount in a short period of time, and in my opinion it's exceedingly unlikely that they continue that trend. As an example, asking prices for a low-mile, 1 of 4,000 unit, ~$160k Ford GT are nearing (and in some cases exceeding depending on the paint scheme) those of a 1 of 1,300 unit $440k Carrera GT. The GT is awesome but it's hard to rationalize it being worth the same as a carbon tub Porsche super car with a truly race-bred V10. There's really only one way to find out, so we'll just have to revisit in a year.
Either way, there's no question the GT makes a great piece of art sitting in the garage, so whether you're driving it or just admiring it, it's a good value for the soul. I can see the value of having a wrapper car just for the joy of it, or a driver to wring out relentlessly. Or if you're lucky like some of these guys, you have 4-5-6, and you're just waiting to unwrap the next one when you've driven the last one enough. I just wouldn't get too caught up in it as an investment.