Researching it properly wouldn't have done you any good, because I know I researched that shit as much as was humanly possible. Either the pool of people in beta was a gigantic bunch of retards unable to do the most basic analysis of probability, or Blizzard massively decreased the spawn rate of blood as a bonus material on elite meaty beast work orders in the launch day patch.
I ended up knocking down the two barns on my alts yesterday before calling it a night. It was just too much hassle to go out and trap shit for such miniscule rewards, plus I still had never seen a single scavenger across all three garrisons. I also knocked down the lumber mill on my main, which was a mistake to ever build in the first place when it could have been a trading post instead. All three characters got a rank 2 inn in the newly opened slot so that I could pick up a pair of scavengers for each along with (hopefully) Millhouse from the quest sometime in the coming week. Not sure how long the inn is worth keeping beyond that point. My alts have trading posts so there's not much reason to knock it down ever, but the DK might need the post eventually.
Basically I have a main with:
Barracks / Bunker (will take this to rank 3 and experiment with the rumors that work orders actually generate a decent amount of follower gear, as opposed to rank 2 which is 90+% scraps only)
Barn / Inn
Engr / BS / Salvage
And alts that are:
Barracks / Stables
Trading Post / Inn
Alch / LW / Salvage and LW / BS / Salvage
The LW and BS buildings are there on the character that doesn't actually have the profession to make the armors, freeing up the character with the prof to only make upgrade items (with my non-existent blood, of course). I feel this is currently about as ideal a set up as I could have. It just sucks that it cost me close to ten thousand additional gold to get there, along with a ton of wasted GR.