Well, maybe you don't ask. But now you want to know, because once you fall in love with a book, you want more like it.
Review it! Many online stores and book sites allow readers to post reviews. A person is more likely to take a chance on a book that 50 people say they loved than 5 people say they do.
Recommend it! Readers have friends who read, and you likely have an idea of their tastes. A recommendation makes a person more likely to find out more about an unknown book. Some authors, such as J.K. Rowling, got further by word of mouth recommendations and kids buying it for their friends, than by traditional marketing methods.
Gift it! I've been running a special-- the book retails at $12 each, but I've been running a 2 for $20 special via direct sales. It encourages people to either buy an extra as a present for a friend or talk them into buying one too and splitting the savings. And I'd never ask this, but two of my buyers spontaneously paid extra, so that someone who wanted it but couldn't afford it could have a copy.
Speaking of buying direct-- when I purchase a crate of books and sell them directly to people at list price, I get more of a share than the royalties if you buy from retailers. I imagine it works the same way for other authors. So don't think you're shorting us if you want a signed copy.
You're also not wasting our time if you contact us with questions or wanting to share your thoughts. Art is about communication, and as FUN as it is for me to write Rafael Jones, I'm not just doing it for myself. Hearing from readers is very motivational. There's a button to send me an email, or just use the comment area. I love you so much just for being interested enough in my work to come here.