Yeah, this is one of the difficulties with determining valuations on our cars. The truly outstanding examples sell privately and the information as to their value does not get incorporated into the public universe of e9 transactions. I am convinced that Hagerty's overly relies on the rusted hulks that are offered every six months on ebay as important clues as to the value of our cars. When I first insured my car two years ago, at $25,000!, Hagerty's was telling me I was toward the top end of the range. I told them they were crazy, and pointed them specifically to the thread on my car's acquisition and the various valuation ranges posted in that thread by folks here who know these cars far better than Hagerty's does.
I have updated my valuation several times since I bought my car, taking into account the work I have done. It is annoying, but each time I do so they ask me did you paint your car. I reply, nicely, no I bought I rust free car with very nice paint and I am working on literally everything else. I redo the electrical system so the car will actually start, and the cooling system so it won't overheat, the suspension, the steering, all the rubber bushings, exhaust, intake...