Difference Between Different Model Train Enthusiasts
This goes the same for every hobby. If there is a hobby, there is a professional collector or collectors to go along with it. These are the guys who drive the values of these model trains.
They are the main buyers and sellers. It's most often more like a business for these people. If they get a good offer for their trains they will sell.
These are also the people who grade the model trains. They will spend hours and days learning about and examining an item before they purchase it.
Lionel (a company which I talk about often in this site) runs collectors clubs for all their past trains they have sold. There are also a lot of groups for collectors only.
A real hobbyist how ever, cannot but help but run their train. They will create sets and layouts so elaborate that it takes months even years to full finish.
They will spend a fortune on accessories and tracks and not give a damn if they get their investment back as it's not about the money, but the joy of the pursuit for them.