I have a reading pet peeve. When I am enjoying an article in a magazine and it ends with the phrase, "for more information about Enjoyable Article, go to www dot whatever." If I wanted to research on the computer, I would not have purchased your magazine!
I am really puzzled about why this would bother you (not saying it shouldn't). Books and magazinws have, for decades at least, included suggestions for further reading, be it books, journals or essays in whatever format, or addresses to write to for more information.
I admit, an expired or inaccurate address isn't exactly helpful, but otherwise this seems in the reader's best interest -- there's only so much space on a page.