If you write Just One Book - it will Probably have many Reads - cause it's the 'Only Book on Your Account' - & your followers & Readers 'have no more books to Read Here' - so They Will Read YOUR ONLY BOOK... - if they find it Interesting :)

And if you have more than one book, let's say two books on your Account - the One they find 'More Interesting' will start gaining more reads than the other one :)

( the same thing happens if you have 3 books or more than that - the Book the Readers will find 'The Most Interesting' will have the greatest number of Reads - the other books may have less reads :) )