you will be a treasure goblin player as soon as you end the noob stage. don't worry, it will happen
When I first played, I picked up everything. I even sold whites and greys. Eventually I salvaged, yay. And then I salvaged only yellows -- taking the time to sell some, and salvage others (depending on which is more profitable).
Eventually, you discover your time is better spent simply killing more monsters, because no matter how much stuff you salvage or vendor, it won't amount to a hill of beans.
Also: once, a very long time ago, I accidentally either salvaged or vendored and left the game on a shoulder that was very dear to me (I right clicked a a junky rare that looked identical, and equipped it). After that I stopped salvaging/vendoring, and just dropped stuff I don't like on the ground, because guess what? one lost item = 1 year of salvaging.