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Hagerty seems like a good enough insurer but it's clear to me from their newsletters that their only interest is in cars as investments. We all know how that works out...
Stuff like this always seems to be contrived (my take on Joe's point). A limited amount of data is broadly extrapolated without regard to reasonable - and true - balancing data. Said differently, they create a 'trend' by reporting on a trend that only they see.