So to follow-up from my previous post- Dodgy Dealings – this was the answer from CreateSpace

Greetings and thank you for contacting us with your inquiry.

Retailers, including Amazon, allow third-parties to sell products on their websites. If your book is available through the Amazon.com or Amazon Europe sales channels, then these third-party sellers may also list your book for sale on your Amazon.com, Amazon.co.uk, Amazon.de, Amazon.fr, Amazon.es and Amazon.it detail pages. CreateSpace is not directly affiliated with these sellers and cannot control the selling price and condition (new or used) of these listings.

Here are some examples of these types of listings:

Sellers can list your book for sale without physical inventory on-hand or list new copy as used. When the seller receives a customer order, they then place an order from Amazon.com, Amazon’s European websites or CreateSpace to fulfill this demand and drop-ship it to the customer. At that time, your title is manufactured; you earn a royalty, and the order is sent to the end customer.

For books enrolled in Expanded Distribution, third-party sellers can create listings on various retail sites both domestically and internationally. These sellers can source your title from the distributors we work with through Expanded Distribution, to fulfill customer orders. Once the title is manufactured, an Expanded Distribution royalty will be reported in your account within 8 weeks.

Sellers can list used copies of your title for sale. If a used copy is sold, you will not receive a royalty for this sale because you previously received the royalty when the title was manufactured and originally sold.

Copies that you purchase of your own title, also known as member orders, may end up being listed for sale on a retail site. Member orders are purchased at a discounted price and do not earn you a royalty. If you give these copies away or sell them to a wholesaler, it’s possible that they may become available for purchase on a retail site. Keep in mind that once your book is in distribution, it can change hands multiple times. If this happens, you will not receive a royalty for the sale because the title is re-sold using a book that you originally purchased at a discounted rate.

I hope this information proves to be helpful, if you have any additional questions or concerns, please do not hesitate to contact us.

We wish you all the best with your book project!

Best regards,

So, I think that explains it well enough. I suspected as much, but it was nice for it to be confirmed.

Oh, and to follow on from Learning a New Language I am now a novice C# programmer!