Take a look at the machines required of a modern fab. Just turning the water on, ultra pure water, can easily cost millions. The actual litho machines are beasts the size of school busses and cost hundreds of millions to spec and install. Then there are dozens of little suppliers of the special reagents, each of which comes from its own billion-dollar supply chain. There are only a few places on earth where all of this is availible at reasonable cost, and silicon valley is thousands of miles away from all of them.