I know a number of (published) railfans and railfan photographers, and rail historians. Many of them - not all - have absolutely
no interest in Model Railroading/Trains of any kind or scale. They spend countless hours taking, buying and looking at RR photos;
hours reading and compiling facts, timetables, drawings and the like. Some are fascinated by a particular road or locomotive (often
extinct).
Yet, many do not have a single model locomotive or boxcar or whatever, in any scale, on the mantle. Some will spend money on
a painting, but buy one of the numerous, excellent-looking and affordable HO (say) models of the very object of their passion.
Not a layout, mind you - for example, just a nice GM&O Alco PA in HO, on the mantle. Maybe a J3a Hudson. Collects photos of them, but a model?
Wouldn't you think that a pretty-accurate 3-dimensional representation of his (extinct) main interest would be desirable?
Nope. I guess not.
I REALLY don't get that one.