Innovators are no supermen. Like everyone else they need a conducive and encouraging environment to realize their full potential. In reality location, laws, business culture, family ties and other factors contribute how successful we are, how mobile we are and whether we will move halfway around the world to be in the global maximum of business opportunity. Case in point what happens if you are a bloke with solid ideas and a great work ethic but are responsible for supporting a relative who is ill ? Also the US has stupid laws which prevent spouses of visa holders from working. Getting a green card helps you overcome that.