I have a slightly different question: considering I have no interest in emigrating to the States, what if my hypothetical startup gets funded by YC or any other american early stage venture firm?

Would I be able to incorporate in US and pay taxes accordingly? Can I keep working from my home country? What are the real, tangible advantages of running your team in US, other then the favorable startup environment you can get in places such as the Valley/SF? Are investors much less inclined to funding foreign teams, does it makes it more troublesome?

Sorry for the loads of questions, but sometimes I fail at understanding why so many people think is a must to go to the states to get a startup off the ground.

And thanks to anyone who will take the time to answer.