Good points so far!
I have also another reasons:
- the learning process. To learn something new keeps you younger and your brain active

And I have to learn a lot! About the history of the early aircraft, about the engineering solutions, how an airbrush works, how to thin paints correctly, how to create wooden air screws, how to rig a British aircraft with RAF wires ....
This learning is directly connected to "the next model will be better!".
- the community. Not only here but also other platforms and live meetings and exhibitions.
(Morons don't build models. Exceptions prove the rule, and, one sometimes makes a fool of oneself. But you know what I mean.)
Cheers,
Frank