Most if not all the people at that table could drop 6 figures on a piece of art, the question is how many of them actually have dropped 6 figures on a piece of art? In my opinion there are no more than 10 whales in this industry that can and do regularly spend 6 figures on artwork (not including dealers).
I may be wrong, and no doubt Gene will correct me, but i believe that the majority of high rollers sitting around that table, would only pay a six figure amount on a piece of art if it was something they really really wanted, and as those kind of pieces dont come around too often, I would not classify them as whales using the definition set out by the OP -" I'm specifically referring to people that can and often do drop 6 figures on OA frequently (monthly or whenever they want"