I don't know if this is well known, I discovered this by accident when redistributing skill points and the crafting board gave me a second quest. Alchemy you can start at 1/8 do that turn in, put a skill point into it to 2/8 and the quest board will give you another Alchemy Daily. Basically you could do 8 Alchemy and 6 Provisioning Daily Crafting Writs a day, though highly impractical as you would have to reset your skill points on those two crafts every day. However, I still think this could be exploitable if someone only used characters that spent points into those crafts alone.