"How's your book doing?" My honest and evasive answer
The problem with book sales is it provided a metric to something I'd actually prefer not to measure. You know how when your kids are young, they hold their hands apart wide and say, “I love you thiiiiiissss much”? It would be as if now you knew precisely how much. And if the answer was anything less than the maximum amount, well then it doesn't feel like quite enough.