That's what I'm lost in though, what's the risk? I'm not paying anything. It's like the only real risk is in the buyer, who might pay a few dollars more for a book they might not like.
You don't really sell as much as the big companies do, since they're not actively advertising your book as much, though. Hmm.. I dunno, budget airlines make a lot of money, despite killer tax, fuel, etc, while the big airlines can lose a lot more even when charging the customers a lot.
Disclaimer: Any sarcasm in my posts will not be mentioned as that would ruin the purpose. It is assumed that the reader is intelligent enough to tell the difference between what is sarcasm and what is not.