You get the royalty. Want more? Raise the price of the book, the other costs are fixed, every penny you raise the price is a penny in your pocket. Do keep in mind you don't want to price it out of the market. Many price their paperbacks to give them the same royalty as the e book. Good Fortune. B
Not sure why you're confused. When you publish at CreateSpace, you're told what the minimum price is. As you plug in various numbers, you're told what the exact royalty is, in every marketplace. If you don't like the royalty you see, you change the price. If you make a change now, it will appear on your Amazon sales page in ten working days or less.
The unit fee is what CS charges you to print the book. Amazon takes 40 percent of the retail price. So if the book costs $3.50 to print, and you price it at $10, the amount going to CS is $6, of which CS keeps the $3.50 and remits $2.50 to you.
I usually price my books so that I will earn a royalty of $1 on expanded distribution -- at Barnes & Noble, for example. That generally gives me an Amazon royalty of $3 or so.
Sorry, I'm still not sure - even though you answered my question.
When I uploaded my book CS said I could not ask less than £7.07 (due to the amount of pages), the unit fee shows as $4.50 dollars or so but the royalties per book is only $0.20c / pence. Surely I get more than just the 20p per paperback?