Actually to clear up a few things.

You can pick the server you want withOUT paying gil. You just create your charcter and delete him until you get on the desired server. That's how most of the importers got onto the Ragnarok server.

Star Craft onli lasts this long cause there are people willing to play and there are no monthly fees
Star Craft is free because the graphics aren't full 3-D and the servers require less to run then say 20 servers running a full 3-D world.

I wouldnt pay to watch people run around and have pretend-sex with eachother, like I've seen on Ultima and Ragnorok.
I don't where you thought up of pretend sex but so far that hasn't happened. Oh ya and this isn't Ultima or Ragnarok online. This you have to pay for and the game mods ban cheaters or members that are harrassing others.