Yeah, i think it is a totally reasonable thing to do, if you're a day trader or a short term investor, or you invest in "growth" companies
_I_ also think it shouldn't matter in non-tech, non-growth companies. If Nestlé or lactalis crash (lactalis might be a bad example, i don't think they have public investors), i doubt Cargill or Heins will take the hit better. If you're a long-term investor (and let's be honest, most of us are) and mostly count on dividends to "make" money, you should be better off investing in old brand without paying the US premium.