A lot of the asian MMOs are "free." In other words, you can download and play the game for free, but you will have to pay money for the perks (high level zones, cool gear, etc.). Lots of people prefer this method around the world, but for whatever reason it's never caught on in the west. I prefer subscription games myself, because it's easier to manage financially (if I had to pay for the perks then I'd end up poor in real life). Most games run between $10-15 a month, and they'll give you a free trial download so you can check it out.