The STRETCH GOAL #1 to raise 95,000 will allow us to print 1,000 hardcover books and 2,000 paperback. So we are offering as a STRETCH REWARD a printed book to all pledges of $100 and up.
But those books can only be printed if we hit our target fundraising goal of $95,000. If we fall short we cannot afford to print the books, so no extra books will be given as rewards. That is how Kickstarter ties Stretch Goals to Stretch Rewards.
If we don't make our Stretch Goal #1 of 95,000 then all rewards listed will still be delivered (assuming the project stays above $40,000 through May 19). So any reward levels that offer a printed book are a guarantee to get a book, be it print on demand or professionally printed, irrespective of if we hit the $95,000.
But if we DO hit that goal, we share the wealth and give all people who pledged $100 or more a physical book (and if that book is paperback, hardback, and how many autographs, all depends on either the reward level picked or the pledged amount).