A startup has to be in the same place as its investors if they want to talk face to face, and empirically we've found this to be a necessity when talking about the subtle and complicated problems startups face. Email and Skype are such poor substitutes that they're a qualitatively different thing. Which means if a startup wants advice from its investors as well as money, they either have to raise money from local investors or one of them has to go to where the other is, at least temporarily.