Even if you know the person well and this type of business manners seem a bit unnecessary to you, try to separate your personal life from your work. (smallbusinessesdoitbetter.com)
It proved that artists can make a full time living from their work and it doesn't have to be a hobby. (theabundantartist.com)
I think that drawing conclusions about an author's life from his works usually reveals more about the critic than the author. (firstthings.com)