I've been a member there for almost as long as here. I usually only come here. That is, when I look anywhere. A year has gone by before when I look at neither.
That is a bad assumption, and it does not matter when it was posted if it was only posted in a place that wasn't looked at by potential bidders. It would have made no difference if you had first posted the thread there the 6th. The same events would have followed.
Generally speaking, I only go to deskthority for the wiki. Within about a year after its formation DT seemed to stratify into mainly being Europeans, leaving all the Americans here. Maybe that's changed, I wouldn't know.
Everyone here acted as normal, it's not our fault you made a banner elsewhere and expect us to be psychic. The only real problem is the unwarranted hostility. That was the only reason I've posted in this thread at all. So the main things for next time is to not make accusations like that if literally nothing has been said about anything. And if you do want to setup a groupbuy you should check if there is a thread about it here and if not make one and then inform everyone in either case.
The only other thing is to be aware that there may be some situations where one collector wants all of it and may outbid the groupbuy. Afterall some of the people you mentioned as being interested have several of each type as it is, so it would not be unexpected for this to also happen. It is an auction on ebay, fair is fair.
Edit: And by post here, I mean here in great finds. I don't know about anyone else, but I never look at the groupbuy subforum because it seems to be 95% about a bunch of cherry keysets and there is no reason for me to comb through that.