This is simple enough, and I think most any writer would feel the same way. This is in regards to your friends and acquaintances asking you for free copies of your books. First of all, whether a writer makes their living writing books or does it on the side, writers are not putting out all of this effort, at times their heart and soul, slashing their wrists and bleeding on pages so you can get something for free. There is the thought: "Well, they are my friend, so maybe I should give them a copy." I've done this and found, nine times out of ten, I've just lost a copy of one of my books, which I could have maybe taken and sold at a signing, or put up on Ebay or Amazon or whatever. The times I have given books away, my only request has been, "After you read it, would you please post a review on Amazon or B&N or somewhere?" I don't think that is an unreasonable request. After all, you worked hard, you put out all the effort, you spilled your blood or some equivalent. And on top of that, you gave it away. I have not given away a lot of copies of my books, but I can say that, out of my simple request to write a review of it (Amazon only requires a review be 22 words long), only the smallest handful (imagine a tiny shard of crystal in a handful of dirt) of friends have ever bothered to write one.
"Well, they are my friend, so maybe I should give them a copy."
They are your friends, and your friends are very supportive, or should be supportive. In other words, your friends should be buying your books, not mooching and getting them for free and then not bothering to give a damn with your simple request to help you out (this doesn't need to be a review, really, but you get the idea).
Many years ago I was at George R.R. Martin's house. It was the day his author copies of Game of Thrones arrived. There were several boxes of them. I've known George my whole life and consider him a pretty good friend. I asked him if I might have a copy. He told me I could buy one. I was young and, at the time, a bit miffed. I get it now.
This is a long way of saying don't ask me for a free copy of one of my books. If by chance you do get one from me for free and I ask you to write a review or whatever, write a fucking review. This is how I pay my debts and bills and keep my phone on, and every sale is important.