Look up the Crystal Villa as one of the many examples. Data is there.Interesting opinion, though it has no basis in real data.
Look it up.As this is the first time I know of, in which diamonds were needed for an in-event purchase linked to a daily special, this point is also seems likely to be wrong. As far as I’ve seen Inno has only had i) event-related sale of diamonds linked to purchasing event currency; ii) the occasional 'sale' of game items for diamonds though Inno's store; iii) buying event currency for diamonds. I’ve never seen diamond purchases linked to an in-event daily special before. But maybe this occurred before 2018?
Daily specials have been up for diamonds during events.