I'm a sucker for anything under glass and the people in real life are nice.
If I had to think about it more, it has the same appeal that cars do for me and many others. There's an aspect of preservation of part of history and culture, style and pop culture appeal from another era, mechanical and electronic tinkery, and best of all customization. To each his own and the hobby seems to embrace the full range of expressions.
Differently than most, playing is barely on the list. Art and aesthetic are tops on my list. What's great is the exact opposite has just as much place and friendship and support in this hobby as anyone else. How can you beat that?