I am a non-American reader however still find it interesting to read the US-carrier information, reading that is a good indicator of what the next gen-iPhone would be like and what technologies it would support.
Perhaps to satisfy some users Macrumors can create a US version and an International version of the home page. It wouldn't be to difficult to create or maintain. When a user visits Macrumors for the first time they ask whether they want to use the US or intl version, the US version will contain everything including US carrier information and the international version everything BUT the US carrier information. Makes sense most major sites have these options.