Even many who did were blown away that I'd written a novel. Their reactions have been fascinating. Those who liked it were effusive. I assume those who have remained silent did not or were troubled by the subject matter. They didn't know I was a weirdo.
Statements arrive quarterly, although there are other ways of tracking sales.
1st Books provides an author's page that details each purchase made through its site. Amazon has a sales ranking which is a bit vague. I was thrilled when I dipped below the million mark and remained there for a month. I assume the TV interview and the reviews moved a few copies. Each site encourages review submission.