While you make a fair point, there is another side to it: Whether or not I actually spend the amount of time reading a piece of text or give up halfway through, too much verbosity (whether that's due to repetition, unnecessary side notes, whatever) leads to me not respecting the message of the text as much as I would have if it was more succinctly written.
There's also a big difference between me comitting a few hours to reading a book by my favorite author, or a set of articles from news outlets I respect, versus some anonymous blogger linked on Hacker News.