And it's not hard to see why: this is an RPG that requires significant time investment. (theguardian.com)
MMOs are a niche within the gaming genre, one which, especially in the old days, required significant time investment at the least, and often requires various real world skills to play, ranging from basic social and research skills to data mining and modding. (mmogames.com)
All other savings require significant time investment but do not pay off that much (babycenter.com)