I share my account with my sister and niece. Between the 3 of us I/we have bought 64 Amazon books (not samples) since Nov 20. And I've downloaded around 30 more from sites like Manybooks and Feedbooks. I've maxed out my Kindle memory and am using the SD card to store old books and make room for more goodies.
I just about always prefer non-fiction. My sister likes gooey murder mystery fiction like Mary Higgins Clark.
Guess I'm addicted.....<sigh>