Weird Kindle Unlimited Author Question

Ummm, well. Ya see, I have this informal list of authors whose history with me is such that if they publish,

I outright buy their story barely taking time to read the synopsis.

However, I was wondering how authors are compensated for borrowed KU titles. For example, Daring Diane's new book, Sorority House Fire, just released on both Kindle and KU. So if I borrow this book first, and read it so big brother KU knows that, return the book,and then buy the story outright? Does the author get credit (and compensated) for both transactions?

I figure Kindle probably has some kind of anti double dipping rule, but it's a dumb question until it's asked. THEN, it becomes merely weird.

Inquiring Cats wanna know!

Warm Furry Hugs!

Tiggs