[real-dino]

It doesn't. They only hold value if you don't build them, and older kits are less desirable as they are constantly improving.

Gunpla are pretty much worthless once you have built them in the same way a movie ticket is worthless once you've watched a film. The journey is where the value is, and much more so than with LEGO sets where you might discover one or two cool building tricks.

Spacewise they are economical. They shrink volume dramatically once built and you don't have to worry about keeping the box.

But if you want deep value, get some Gamestop or some crypto. They are much more economical space wise.