Guild Wars 2

So i was thinking of making a necro to maximize my profit because of the smart loot changes. My guardians profit decreased by 40%.

If i level all my crafting discipline to lvl 400. How much level will I gain?

80 levels

An Error Prevented Saving:
Message Body length must at least be 15.

Really? Getting 400 to all 8 craftings will get me lvl 80? Are you sure? I though anet nerfed it?

http://wiki.guildwars2.com/wiki/Crafting#Crafting_experience

According to Wiki…10 levels for 500, ~7 levels for 400.

Thus, in answer to your original question, ~56 levels.