So it's better to actually vendor crap blues instead of salvaging Essences/Teeth from them now?
Yeah. Vendor every blue unless you're gonna put them on a follower or save them for another char or something.
It isn't till you get to the Nightmare-level Lizard Eyes (about 200 each) and the Hell/Inferno mats that prices start to go up.
What makes you say that? If you were levelling your crafter then salvaging is much more useful than cheap change.
It's pointless to salvage blues on Normal/Nightmare. Subtle & Shimmering Essences sell for far less on the AH than you can vendor simple blues for. If you want Subtle Essences it is far cheaper and much quicker simply to buy them in bulk off the AH.
The only reason to salvage blues at this point on Normal/Nightmare is if you are insistent on not using the AH whatsoever.