There was a period where they did. Where one of the reasons people buy a certain brand of PC (like Packard-Bell) was that it came with a unique UI experience.

There was a period where they did. Where one of the reasons people buy a certain brand of PC (like Packard-Bell) was that it came with a unique UI experience. But then that got to be seen as a negative, the market reacted, and those custom skins disappeared. I don't want Sony's Rachael interface so I don't buy an X10, and if enough people feel that way Sony will either improve it or dump it. That's how a normal market works.