Wow that’s pretty awesome!
Just to add my two cents 
I’ve been working on a flash mmo lately (commercial that is) and the big players (club penguin etc) have a conversion rate of 2-4% from free users to paying users. Since they have a few million that’s an ok deal.
But as you can see a lot of free players simply does not convert but just take up bandwidth an server space.
Micro transactions are all the craze these days, but I haven’t seen a lot of money in them during the course of two professional mmo’s
Using a subscription based model will also result in a more stable playerbase as long as the game delivers a experience that could potentially go on for a long time. Hope it makes sense
/Ozak
[quote]have a conversion rate of 2-4% from free users
[/quote]
I wonder, does that conversion rate count all players or just regulars?
In my estimate of 10% I was not counting players who try it once or twice and then leave. The game will clean those players up so they don’t take a slot from regular players.
If it is as low as 2% of regular players, I am in trouble as I would basically just be covering server costs at that rate.