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I've done some research on this game for the past few years and wasn't planning on buying it until a few days ago. And I'm doing it because I know truly in my heart that this game is going to be successful.
Remember the days when Blizzard created those AWESOME games. Those games that weren't for the money, but was to please gamers throughout the world. Well that Blizzard is gone, and ArenaNet; the company behind Guild Wars 2 is the most successful studio that came outta Blizzard.
So there's one: AreanaNet a studio formed from a very successful company; Blizzard
Number 2: The Guild Wars franchise as a whole as already sold more than 7 million copies. So let's do the math. Let's say that the game sold 1 million copies and raised 50 million dollars from those 1 million copies. Now, the game went on to sell more than 6 million copies TOTAL. So 1 million + 6 million is 7 million. So 6 million copies worth of revenue is 300 million dollars. In subscriber numbers that's 300 million divided by 15 dollars divided by 7 years. That's an average of 2 MILLION subscribers per year!
And yes, I know box sales and expansions. So let's even say, 1.5 million subs. That's a successful MMO.
(Guild Wars sales source: http://wiki.guildwars2.com/wiki/NCsoft )
EDIT: Between 2009 and 2012 the series did sell another million copies.
Number 3: It doesn't compete with all the other MMOs out there. With each MMO that comes out that costs 15 dollars a month. Most people can only afford 2 MMOs at once per month. And others only pay for one. So if you play WoW you won't be playing other MMOs. But if you play other MMOs you won't be playing...you get the point.
Guild Wars 2 doesn't have to compete with that. Meaning that if it can WIN in the F2P market then it's already the WoW of F2P. Not that this game is going to be anything like WoW. Already the difference in revenue models is a good difference.
Number 4: The Guild Wars franchise is already a well known name. Why was Star Wars: The Old Republic so popular from the get go? Because Star Wars was well known. BioWare was well known. And together they created an EXTREMELY hyped game. Hopefully Guild Wars 2 does the same thing and it will instantly becaome successful.
Number 5: The bad economy. Most of us including me just don't have jobs. So we can't afford a 15 dollar a month subscriber fee. And if we can we'll only afford to play one game. So with Guild Wars 2. Those who can come up with the 60 dollars will be able to play a game that won't cost them anything FOREVER! Well until the servers shutdown. In a bad economy, saving isn't such a bad thing.