considering you can get any battle class from 1-50 in a week means all of the content between 1 and 50 is meaningless because it will reward gear that is useless a day or 2 after you get it. therefore "endgame" content is the only really content they have to keep people playing. this campaign lasts 10 days so in that time you could get at least 1 job from 1-50 evn if u just bought the game and if you didnt pick the right class (WAR BLM BRD or WHM) you wont be able to do anything efficiently in the final 3 days of your free period.