Class hunting logs are for classes, not jobs - hence the new jobs wouldn't have class hunting logs, since they don't have base classes. Also, if you do the marks at or close to level appropriate, you'll notice it's a decent chunk of XP at lower levels, though it might not scale as well post 45. These were also implemented in the days prior to the duty roulettes so the rewards might pale in comparison to those, but hey - any bit helps.