How come Brand new Doublewides are made so cheaply, and sold so expensive?

Went to LTS Homes in NY, and although from the outside it's inviting apart from the cement slab the walls inside I noticed either had cracks in it, or tissue thin. I noticed stains around the windows on the ceiling, so I don't think the roof handles well with rain and such. These homes go for over $70,000 , so how do they get away with making them so cheaply and sell them for a lot, when it isn't a real home?