RuneScape has been a growing success for Jagex, and Gamesbrief recently took a look at the company's profits for March 2008 - March 2009: "UK studio Jagex [...] generated £38.4 million in revenues ($59.3M) and £18 million in profits ($27.8M) during the March 2008 to March 2009 period." That's a pretty impressive figure, particularly when you take into account how far Jagex has come from £5.2 million ($8M) in revenues and a £2.7 million profit ($4.2M) back in 2004.
Jagex definitely has RuneScape to thank for the majority of this, of course. 94% of this most recent round of profits came from RuneScape subscriptions, according to the Gamesbrief report. Considering that the game is free-to-play, the figures are nothing short of impressive.
Take a look at Gamesbrief for the full story.