Trade skills (am i missing one) ?

[Schwarz]

How is grinding through all the skill ups to get a BOP trinket from alchemy better than grinding through all the skillups to get several BOP armor items from leather working? 1 Trinket vs 3 pieces of Epic Armor...

I think you misremebered my post. The point was I trying to get across is you might have to do several reputation grinds to get all of your professions up. I might have spoke a little too soon but I think that getting recipes from various quartermasters will make the leveling of skills easier.

so for example for your leather worker you grind ogres to get your Kurenai/ Mag'har faction
for your jewelcrafter you get your Shattered Sun Rep up for various recipes.

I am sure there are more examples out there. I would look at powerleveling guides to see what level of rep you need with various factions.

Rep vs Skill ups....