It is not enough for a title to be good (that is, a fitting description of the events of the plot that also strikes the right tone and implies the themes surrounding it), it must be enticing to the target audience and lend itself to marketing.
Oftentimes, developing target audiences can reveal interesting information about how to get the book into the hands of the reader. For example, if members of a target audience are likely to listen to podcasts, then the marketing plan for the book should include some reviews by podcasts they probably listen to.
I sat next to a woman on a cross-country flight who read Fifty Shades of Grey from cover to cover with such rapt attention that she didn’t respond to the flight attendant. When we landed, the woman looked confused and not too happy to step back into real life. She collected her things with the glazed, glassy eyes of the fictive spell.