Because the purpose of investing one's money is to attempt to preserve wealth. Dumping a bunch of money into a domestic factory with way higher variable costs that are structurally never going to improve is a surefire way to lose money. In contrast housing prices literally only go up and NFTs have non-zero chance at not losing all your money, which is better than a commodity factory in the US.

I think we'll see more onshoring if robotics ever gets to the point where factories can be cheaply fully automated.