In any MMO, Launch ( Honeymoon phase), has a HUGE spike uprise in players until about the end of the free trial. After that, they don't wanna pay for the subscription for various reasons:
1) They hate the thought of paying for a sub for a game that they own
2) Some people just won't like the game
3) Rushers ( Get to max have nothing to do and quit for a time or perhaps forever)
4) Community/Experience with the Community (either in a good or bad way will determine if they will stay or not, especially if they are new to MMOs)
And so on, for the subs to be at 600k when they were only foreseeing only like 250k is a very big triumph for a game that was on the verge of defeat.
They have 350k more subs then they were originally planning for. In a manner of speaking, they have a lot of sub room to work with!
