If someone you know has just published a book—do you feel obliged to buy a copy? Even if it’s not the kind of book you’d normally read?
Tricky question! I have bought books that were published by friends which I never read. However, I have also sneakily ignored these kind of books just to get out of buying them. On the other hand, I have also bought books published by friends/acquaintances because I knew I would enjoy reading them. Most of these, by the way, fall under self-published rewritten fanfiction tales.