I get it dude, I really do... But the subscription fee does pay for the free content patches and maintenance (both of which are not usually an issue in regular games that do not have a subscription fee), but they are definitely still making a profit on it.
WoW is one-and-only, and I find it to be one of the most rewarding video game experience. I would give the trial a whirl, and go from there (just make sure you join a decent realm).
ONTOPIC: What exactly about RS is better than WoW?