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Isn't all the specialization stuff soulbound?
No. Speaking only from experience as an Elemental LW, there are only 2 patterns you can learn from the Elemental Trainer that are BoE. Helm of Fire and Gauntlets of the Sea. Everything else available from the trainer is BoP.
Since world drop and vendor bought patterns can now be made by any LW regardless of specialization, IMHO, you would be better off not picking a specilazation at all since you would get no benefit from the epic sets you can make at 375.
OTOH, if you want to know what some good money makers are in the different specializations, I'll say Helm of Fire was my best seller, usually selling for around 50g each. Of course this is only my experience as an Elemental LW and maybe some of the other specialist can give you an insight on what sold best for them.