A bit late to this thread. I generally agree with Gene and John S. Based on the definition being used**, I think it is between 10-15 excluding dealers. It would be mildly interesting if someone set up a ballot with the categories identified by Gene to see what % of Board respondents correlate to each category.
And love the jokes about the Cabal (or are they jokes?!? ).
**By the way, it's seems that the OP's definition has drifted a bit or been interpreted a bit differently later in the thread---in the first posting, it was spend 6 figures on OA frequently--not 6 figures on a single piece of OA frequently. For purposes of separately the true whales from the rest of the pack, the definition of 6 figures on a single piece of OA frequently is I think probably more appropriate.