Square not having that money. Dude. Really. Don't eat the shrooms that grow on graves in Eorzea.
Did you look into what games have the Square Enix Brand? None of them has bad selling nummers.

And you cant compare a MMO to an Egoshooter.
You can run a dedicated server on almost any machine for Egoshooters. Can you run an MMO server on your 4 year old laptop? no you can't.
For an MMO that has like 30k players in storrage. You need something big. Serverfarms.
For most of the curretnly obtainable Egoshooters the servers don't need that much power. because they dont have to calculate a huge world with several connection points and different mob behaviour and what not.
They are a map, no matter how large. With lots of static objects. some moveable objects that react to surroundings.