The Streych Goal depend on how succesful the campaign is.
The more money is collected through kickstarter, the better/bigger the Volume will be.
Not to be confused with Pledge level, that depends on how much you contribute to the volume.
Aka:
at pledge level £14 you get a copy of the book
at pledge level £200 you get ... [list of stuff]
This depends ONLY on how much money you want to invest. On individual level.
The more you give, the more you get.
at £6000 the book is founded (this means that it will be done 100%)
at £8000 the book will be bigger (extra 32 pages)
at £10000 the book will have a Tarot Bag bonus
at £12000 other more pages
at £15000 the book will be hardcover
This depends on how much is collected as a whole, independently by what a single person has given.
It means that the same pledge (£14) will have the book, but if the campaign is succesful, for the same £14 the book will be bigger, hardcover, with tarot bag, etc...