Amazon still has yet to reveal how many Kindle users have signed up for Kindle Unlimited, but if the KDP Select fund is any indication then the subscriber base must be growing at a steady clip.
Amazon announced in the monthly KDP newsletter today that they were boosting the monthly pool for a second time:
We have continued to see significant early trial response from customers to KU. Similar to what we've done in the past around holiday spikes in borrowing activity, we are adding a bonus of $2 million in September on top of the regular base fund amount of $3 million bringing the total fund to $5 million.
In comparison, the pool for August was $2,000,000, with a $2.7 million bonus.
Amazon also confirmed today that they are going to keep the KDP Select All-Stars awards program which was launched last month. This program takes around $600 thousand and divides it among the top 100 best performing authors and 100 most popular books for the month of September. The authors will receive any where from $1,000 to $25,000, while the authors of the 100 most popular titles in KDP Select will get anywhere from $500 to $2,500 per book.
Launched in late 2011, KDP Select is a special program in Amazon’s self-pub platform which offers indie authors special privileges in exchange for exclusivity.
Any ebooks submitted to the program cannot be sold elsewhere, and in return Amazon gives authors extra promotional opportunities. eBooks in KDP Select are also entered into the Kindle Owner’s Lending Library and Kindle Unlimited, earning the author a share of a pool of money ($5 million for September 2014) for each time their ebook is loaned to a Kindle user.
Kindle Owner's Lending Library and Kindle Unlimited are currently available in the US, UK, and Germany. The former is a free part of Amazon Prime, while the latter is sold under a monthly subscription which lets Kindle users read as many titles in a given month as they like.