Your favorite authors write their imaginations to the bone, and 97% of them have to have a day job to keep moldy bread on the table and electricity in their laptops.* Fortunately for them, their needs are few, their wants fewer, and their main hobby is really inexpensive.
If you want them to give you more great books to read, then give them a little promotional boost.** It costs you a few seconds to click on that fifth star and make a positive remark, a little longer if you like to give a 750 word detailed analysis of theme and symbolism (hint: Old Yeller represents the innocence of childhood).
Somewhere out there, a writer is thinking how nice it is to give the gift of a good story to someone who needs a little rest at the end of the day. Let them know you appreciate it.
*Actually, a spouse with a good job and a passion for the arts really helps with the moldy bread and electricity part. Can electricity be moldy?
**Share a good book with a friend. The main thing writers like is knowing they have given someone a little happiness and pleasure. Also money. They like money. But mostly giving happiness.