Well, "floored" or not, many companies don't prevacuum, and I for one, am looking for ways to stop having to do this myself. Why? Well, for one thing, because I'm convinced that vacuuming is not that big a deal. It's an internet fed phenomenon that resulted from Lonnie McDonald, and his buddies, looking for ways to make the requirements have some substance. We can't have carpeting cleaning criteria with only two steps, now CAN WE?
I have tested myself, and found that vacuuming half a room will net no more debris in my canister than what I find in my in-line filter by only cleaning the other half of the room - not vacuumed. So please don't insult my intelligence by trying to tell me that HWE won't remove hair, sand and grit.
Plus, in my market (now I'm just freaking sure it's only my market ..._right?) I can't get bulletin board prices. 25 cents a sf is the top end for me, and at 25 cents a foot, I can't make $75.00 per hour if I prevacuum. Not unless I sell a ton of add-on's, anyway.
However, far be it for me to put a dampener on any bulletin board "reality", so carry on.