Microsoft makes something you RUN on PCs. The PCs themselves have different brands. There isn't the same logic of "hey, let's go to the place that only sells Apple computers, no Toshiba or HP"
Yes, but Samsung is positioning themselves to control the whole widget - hardware and software - just like Apple. Controlling the retail experience will be part of that, just like Apple. It's disgusting that they are mimicking Apple, but I think they might actually be successful.