It felt as if GT valuations were in decline for a few months and Hagerty shows a pretty substantial drop (>$30k). Perhaps related to the release of the NFGT. Based on what I have seen for the past month or so, values seem to have rebounded a bit. It will be interesting to see what Hagerty shows when they release their January numbers.
https://www.hagerty.com/apps/valuationtools/2006-Ford-GT
https://www.hagerty.com/apps/valuationtools/2006-Ford-GT