I looked at the list of differences between free, premium and VIP player levels. I can see almost no advantage to pay a monthly subsrciption. You get 500 "free" points per month for $14.99. I can buy 900 for $11.99 as a free player. A free player gets 2 character slots, premium 4 and VIP 10 - so what? You can only play one at a time anyway. Free players can't post on the forums - again, so what? Free player gets no tech support, who cares when there's a KB available.
My point is if you want people to subcribe you better come up with about 2000 points per month, and make sure I have access to everything in the game without spending another dime. I know there is some marketing type thinking that free players will spend more because the really won't pay attention to how much money they spend on points each month. You're probably right, but I'm not joining them.
Make it an advantage to subscribe if you want steady customers!