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No crafting recipes are profitable right? Wrong. You can use Guild Wars Trade to find profitable crafting recipes as of like 15 minutes ago. Then you look at Guild Wars 2 Wiki to see what materials are required for the recipe (or you look it up in game on your character). Last, but not least, you look up each material on Guild Wars 2 Spidy to see when their prices tend to go up/down.
Purchase the items you looked up on Guild Wars 2 Spidy with buy orders when you expect them to be cheaper. Place the buy orders a little before that time so you're first in line to receive them.
Craft your items later in the week, or next week, for a huge discount compared to what Guild Wars Trade initially told you.
Rinse, repeat, make it a system.
End of Tutorial. You are now a master craftsman in Guild Wars 2.