So you're saying there is no marketing potential from exposing a product to hundreds of thousands of your intended audience? Companies wouldn't bother attending E3 if they did not think the exposure of their product would benefit its sales in some way. They aren't there just to drive visitors to your website.
It wouldn't be the first time a game has appeared at multiple E3s either, in fact FFXIII was at E3 2006, 2008 and 2009, a game people were already well aware of by 2009. So what exactly is wrong with SE revealing FFXIV at E3 2009 and then releasing a new trailer at E3 2013 as well as new info on upcoming exciting patches or even announcing the first expansion for 2014 along with a trailer? You can easily talk about a product people have seen while making new announcements.
And yes, I am wasting my time if you don't agree with me, just like you are with me. We're both trying to predict the future here and only time will tell who is right. Not constant "im rite ur rong" arguments on a bloody forum.