Adding the personal touch to your service

What do you do to put the personal touch on what you provide to clients?
I ask this because I’ve noticed a trend amongst people buying my book. That is, most people have specificially asked for an autographed copy. Why is that? The contents of the book don’t change, the messages and the calls to action within the book are the same. The amount of time required to read the book is identical. My conclusion is that people need to feel a personal connection with the goods and services they purchase. Or more particularly, with the people behind those goods and services.
A signature on my book distinguishes Your Professional Headspace from all the other books on someone’s book shelves. Amongst a sea of hundreds of books, mine is one that stands out. Interesting to think that achieving this distinction costs me nothing to provide and takes less than a minute to execute.
If one can achieve this outcome with a simple commodity (a book), how much more scope is there to incorporate into an ongoing professional relationship?
What are the human touches you can insert into your client experience to let them know you are attuned to them and their situation?
Why not have a meeting with your team today to develop some ideas? Better still, what about implementing the best of those ideas straight away?