Ack! I'm so sorry it's been confusing!
I call it the collector's edition because it just collects both volumes into one book! There's nothing at all that's extra or super special about the collector's edition except that it's just handy to have one giant book vs two separate books--
However! I know that a lot of people also like the option of two separate books instead of one! So at the end of the kickstarter, everyone who pledged the story can choose between having the story in two volumes or one large volume!
It will not be exclusive to kickstarter :) I'm so sorry again it's been confusing! I just really like giving everyone more options! ^^'