Why Can't We All Be Friends?

Why can't the east coast and the west coast get along? Here are two major brands that market their products under different names on each coast. I bet there are more. I understand brand loyalty is important- but is it really worth all the work? In the case above, these two companies have to maintain two identical websites where the only difference is the product name. If you're feeling really board, check out the following:

Edy's vs. Dreyer's
Hellmann's vs. Best Foods


I especially encourage you to venture to the video section of Edy's/Dreyer's and watch how they had to produce two of every video with different logos on the sets and in the script.