As a contractor or manufacturing company that's not what you're investing into. You build the machines and process and design the house. So in one case you get 200k out of the invest, and in the other 1000k. At least that's how I'm reading this.

If you, as a single household, plan to build a 50k house on your land, you might be unable to find someone to build it for you.

Of course in larger cities/projects with a single developer reselling units it's a bit different.

As I said, that's how I'm reading it.