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Depends on what you buy
Anything you buy through Audible.com is not going to give me anything. Audible takes something like 80 to 88 percent of the cost of the book.
If you buy THE ROOKIE from the iTunes store, to read on your iPhone or iPod Touch, I make more from that than I do from a hardcover of CONTAGIOUS or INFECTED (crazy, sure, but true).
But the main point here is you buy what's convenient for you. You are the customer. I appreciate your business no matter how you patronize my efforts, but you're the one spending your cash so do what works for you.