Signing up to Google Play Books, you automatically sign up to Google Books as well. Google Books is a project aiming to create a catalogue of every book ever published.
Getting into Google Books has two consequences:
1) The book's content is searchable in Google.
2) Google makes 20% of the book available on Google Books as preview in a PDF like format.
Why is this good for you? As google is officially a verb now meaning 'to search', it is not surprising that Google will do everything in their power to get your books to the top of the search results. This includes keywords and full text searching: if you have characters with a special name or are writing about a niche topic, chances are that readers will find your book.
On the book's listing, it offers you to buy the ebook (it redirects you to Google Play Store), and lists any print buy options if available.
We work with Google based on wholesale model: publishers set a digital list price, but in the end the retailer (Google) sets the final price for ebooks. Google is usually trying to sell ebooks cheaper than any other channel, discounting the books at a pseudorandom way, depending on price and currency.
Being aware of the Google discounting, we automatically adjust the retail price given by the publisher to avoid price matching by Amazon. Our algorithm tries to keep prices in line with the Digital List Price.
Payment will be based on Digital List Price.