Almost always there is a war on Thoria. 1-2 months after one war ends, the other one starts. Although there was no war since January of 2012. There are a lot of retired people who use their characters just to PK. There aren't many people online usually. When there is a war, most of respawn places are free, but you have to wait long for respawn of monsters, because of too few people online. The community of Thoria has grown due to friendly social policy of leading guild. Thoria is good choice if you have friends here, who can help you, or if you want just to get some exp and fight against others.
Prices are low and there aren't many high levels as for not-so-new world, so you can always try to get into highscores lists. A lot of quest services are hosted by Anima members.