Perhaps it's the sense of adventure that comes with the memories of watching
Star Wars,
Battlestar Galactica,
Star Trek, real space missions, etc.. By comparison, most buildings are pretty tame and therefore not particularly enticing modeling subjects unless they have a truly unique architecture like the Munster's house or the Addams Family house, or some level of historical significance like the U.S. Capitol building, the Empire State building, or the Alamo...
I've seen train set-ups with intricately detailed mountains, gorges, tunnels, bridges, trees, and so on, but the buildings were clearly purchased, pulled out of their boxes, and placed onto the set-ups as-is with no work done to make them look more realistic....
Maybe a kit like the Wright Flyer would get more attention here if someone made a popular movie about the Wright Brothers.
