Who do we write for? The answer is simple: we write for ourselves and for 'an audience'. Every writer cares for this 'audience'; those he can see and those he cannot but all come together with his writings.
I have seen people that write and then hide their art fearing it is not good enough to be shared with the audience. And then there are those prolific writers that are good at writing and engaging the audience. So 'the audience' is crucial to a writer. I personally look forward to comments left by my audience and it gives me a good feeling that someone took the time to read what I composed. For that, I am ever grateful.. In return, I too take time out of my busy schedule to say a few words to them. This builds an important bond between writer and the audience.
This is a busy world. But to let another person know that he/she is appreciated for what he/she has done, or has written, painted or made is equally important and encouraging. Every person floats once awhile on an encouraging word....if you offer it.