The triple turn-in ones usually require you to make 3 or 5 items per turn-in. The reward per item is horrendously low. The only thing those are good at is maximizing your leve allowances. If leve allowances are an issue for you, I recommend doing Ixali quests and grand company turn-ins instead.

By the time I got to my last few crafts to level, my preferred method was to do the travel leves and do multiple leves at the same turn-in location for different classes to get more for the time spent traveling.