So... the reason for exclusives - is simply that. To keep MAC exclusive and in regards to only certain stores getting a particular collection... well MAC like to treat their stores who are performing well and seeing as Brown Thomas is at number two and have done amazingly well to get there, (selfridges london, no.1) they were treated with Colour Forms.
Hope this helps clear things up. Also... I guess for the more avid fans not in reach of the collection, I feel we were emailed pretty much as soon as the collection was launched online.
I guess its up to us how far we take our obsession and what we come to expect... but thats a completely different thread topic!