Reading Topic: hatchback
Itäs always like this. In sweden I belive a hatch is 3000 SEK (about 3-400 dollars) over sedan, and wagon is about 5000 SEK more then sedan.
The hatch has a much bigger trunk lid (which also reqires air-pistons to stay up); larger rear window, window wiper, cargo cover ect. The C-pillar is somewhat larger as well, so you actually get "more metal" as well. The wagon also has all these things + two side windows more, a cargo net (maybe on the hatch too?) and a lot of extra metal on the roof.
The only thing you DON'T get with the wagon and hatch is the extra key that enables you to lock the trunk, and still have access to doors and drive the car with the standard key, so you for example can have your car in the shop or something without anyone getting in to the trunk. Quite meaningless on the wagon and hatch as it's "quite" easy to get in there from inside the car anyway.