It's just that people don't realise how big the non-consumer market is. In the essay I referred to, Hayek fairly neatly demonstrates that quite small increases in a consumer market can have multiplicative effects on the structure of production.
In this very thread people are griping about the "difficulty" of selling to businesses. I don't know what to make of that.
When you sell to a business you still sell to a person, it's just that said person feels like they are paying with monopoly money. They have a psychological distance that a consumer just doesn't have.
I'm interested about your observation on the size of our domestic markets changing our thinking. Possibly. It would be interesting to see where the Chinese startup scene are focusing their efforts; they are already dealing with a USA-sized middle class and it will only get bigger.