The gaming industry is a relatively young and small expensive business. We can extrapolate from sales on what's trending, and what will be trending from design choices to a lot more about future games. The most discussed sales are platform sales. They show how much support the platform will get, and from which developers it will get it from. Based on it's regional and software sales. This is all just an extension of ones interest in gaming news. There's also a sense of community in discussing these news and what they mean, which are also correlated with sales. Overall, this may or may not effect ones interest in certain games and/or platforms. It will however help with making educated decisions in what software geamers, as consumers, will buy based on their interest.
I agree that your examples tell how limited your understanding is of the gaming industry, and you're generalizations also show how you view the communities you're trying to criticize.
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