Have you ever read a book?
Really, you have?
I am so proud.
Have you ever read a book and once you finish it, you want to read it again? Now that you know the characters better, do you want to go back and see all those character traits again?
Kind of like when you finished watching Sixth Sense and (spoiler alert) you find out he's been dead the whole time. You want to go back and see how you missed that through the whole movie.
I just finished a book with four young men as the main characters (with a two girls as well). They are all immature and wealthy. (I am sure you can imagine where that leads to.) Their interactions were so fun. Towards the end of the book I was laughing hysterically. I had to stop reading because I was blinded by tears of joy.
Now I want to go back and re-read it. Now that I see how they are, I want to see their interactions in the beginning, when I hadn't fully appreciated them.
When I write, sometimes I want to spill the beans completely. "This man is bad!" "This girl is a heartless flirt!" But sometimes the joy is in savoring the reveal. Taking time to let us know the characters.
So may we write so that our readers want to reread our books.