People here are very helpful. The fact that a 30% off deal is even posted amongst a group of resellers is amazing. You can't expect others to do your research, aka homework, for you and tell you what to buy.
Yes this site can be very helpful. Among us there is much shared, as I've tried to do myself because I've been on the receiving end of helpful information many times. I can't buy everything and I realize the crowd is small so I don't have any issues sharing. Does this make me less successful, help the competition? Of course, but this stuff is going to be bought by resellers one way or the other, so it might as well be the ones on this site. For example, check out LEGOLAND California right now, they have had a lot of restocks lately with some decent markdowns and no tax for certain states.
https://shop-california.legoland.com/collections/all?sort_by=created-descending
As far as the homework topic goes, we all have our own niche and usually stick to it. Is it so bad to ask for a couple pointers when a blanket sale like this goes live? Maybe it is. But now the point is moot because most everything good is gone, props to everyone who got some good deals and I hope the orders actually ship!