To use as comparison, I'm surprised Terry Sayther's early CSL didn't pull in more money:
bringatrailer.com
But he has a very good (and smart) attitude about it:
"I’m not unhappy that the car didn't sell now, because each time that has happened in the past, the value has continued to increase"

34-Years-Owned 1972 BMW 3.0 CSL 5-Speed
Bid for the chance to own a 34-Years-Owned 1972 BMW 3.0 CSL 5-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #29,363.
But he has a very good (and smart) attitude about it:
"I’m not unhappy that the car didn't sell now, because each time that has happened in the past, the value has continued to increase"