Events selling out this fast is nothing unusual. Followed by the mass calls of foul play and 'something went wrong, last one didn't sell out this fast, there's no way!" 2 years is a long time, FFXIV is a lot more popular now than it was last fan fest, also more people know about it this time since there have been two before it. If you look at other cons this kind of thing also has happened. First couple of Blizzcons didn't sell out super fast, third one did, and it has since.

Fact of the matter is, there's no way to accommodate everyone who wants to go. And no you're not 'entitled' to go. All you can do is take every precaution you can to increase your odds and hope you get in.