Because when you create a block there is nothing to retain, since it doesn't exist in the heap until you copy it there with Block_copy.
This is covered in the WWDC lectures about blocks. However, as of iOS 6 they are treated as regular objects so you don't need to worry. After you copy them you can retain them as you please.
Why should we copy blocks rather than retain?
Why should we copy blocks rather than retain?
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