This thread was pretty interesting to me.
Driftwood did you post your work (on the wiki or something?). Frankly, I think even 20% of the job done would be interesting to see. I also agree that other people would chime in if it was in a forum thread.
A link to it could surely be made in "Forum information and useful threads" sticky at the very least I would think?
My two cents is:
Core zones from The Serpent's Spine are the best plat per effort per level in the lower-level game for straight-up vendor trash: Blightfire, Goru'Kar Mesa, Blackfeather Roost.
Once you are 65-75+ (will vary for classes) some old raid zones that become trivial can be decent coin drop for the effort/risk involved. (This is where the Hole comes in for example) and places like Dulak's Harbour with reasonably frequent gem drops become better as you can kill fast to make up for the lesser value drops (than say a level 70 zone).
I'd be pretty interested to hear about the good bazaarable drops though as that changes over time (and varies per server).