the option to pay for a premium account giving x2 exp, guaranteed server slot(enter server, even if full), running multiple clients. Also, of course theirs a "cash shop", where you can buy various items, and from what I've seen on the l2.ru, its not anything that interferes TOO much with gameplay. A few things in cash shop include, ® Grade SS/BSS, Auxiliary Stones, Elixers, Agathions, Mounts, Town SOE's, Teleport flags, basic buff scrolls. Yeah, sure, there are a few things such as Auxiliary Stones that you can say "pay to win, no thanks", but they have to make their money some how.