Marketing concept

Can the marketing concept reach a point of diminishing returns?

The marketing concept can reach a point of diminishing returns. An example is Coca-Cola. I am always seeing new types out like Coke 0, Diet coke, Low carb Coke, Sugar free coke and so one. It seems like every time I go into a gas station I see a "new" type of coke, but how different can they really be? I think this type of marketing is targeting too many different types of people when "Diet Coke" and "Coke 0" are just fine. Another example is stride gum. There are always new types of stride gum that really do not differ all that much. They are always coming and going like they are trying too hard to come out with the best gum product that they put a bunch of weird tasting useless gum out.

Do you get annoyed with these large companies always coming out with a new product, that is just the same as the old one but with a different label?