New Amazon.com Service No Bargain
The only giveaway is the pricing page. They get a percentage of the sale plus a fixed per copy price. This cost rapidly adds up. As an example, say that you have a 264-page B&W book. According to the chart on the page, the fixed charge per copy would be $6.78. In addition, they want 20% of the list price if you sell through them or direct, and 40% of the list price if you sell through Amazon.
Let's say that you set the price at $20 a copy. If you sell through the CreateSpace page, you pay 20% plus the per copy price, for a total of $10.78, or over 50%. That's hardly a way to do well in self-publishing, because you'll have the editing and design costs, marketing, etc.
If you sold through Amazon, they'd want, 40% off the list price. Now, it's not clear whether that's the only percentage they want, or you'd also have to have one of the Amazon Advantage accounts as well. Say you don't. That means the cost is 40% of list, which is $8. But you still have to take out the $6.78 per copy cost, with a total of $14.68. You'd effectively pay close to 73% royalties to Amazon, and that not quite 27% isn't going to cover all your costs of creating the book in the first place, so you could conceivably lose money on each sale. Better to find another way to get yourself into print.