Well, how about if I need a book now, but I just don't have the money? Can I pay you later? I'm an honest person, I'll bring in the money some other time.
Please do not take items from the Bookstore without paying for them at the time of purchase. We are not questioning your honesty or integrity, you simply need to check out through our bookstore register to make our accounting correct as we are no longer on a self-serve basis. Our Bookstore does function like any other business, and it is not okay to take something without paying. This also relates to a basic Buddhist concept : taking what is "not freely given" creates bad karma for your future self.