The fellow I bought my ERA from drove it 450 miles in the almost 3 years he owned it. Lots of people own these cars and rarely drive them, but 450 miles was as low as I've ever seen!
I would think the same rule applies to other exoctic cars as well. Like some Ferraris and 32 Ford Coupes, etc. Maybe, for some, it is enough just to have one in the garage, like "art". They are a beautiful car. Some of us are "drivers" and some of us are "collectors". It's all good.
...and the Kirkham in question here IS a piece of art, an outstanding example of the marque.