I enjoy a good rumor as much as anybody else, but what the Internet makes up for in speed and breadth it does oftentimes at the sacrifice of accountability. I wonder if, to be competitive online, you just don't have that much time to double-check information; somebody could beat you to the news, and then you lose all those oh-so-precious links.
And the added wrinkle here is that, with old school media, you had to be sure that what you sent out was right, because it was very difficult to correct it after the fact (i.e. running a correction, noting the error on-air). With the Internet, you can just slide into a post and edit it away -- unless you commit a very high-profile boner as our friends at NFL Draft Bible did.