They're on the front line of the marketplace. But remember, the three most important things in a book are reader payoff, reader payoff, and reader payoff. Answer honestly, otherwise you'll lie in bed nights, gnawed by that question. Of course, you may well be, but you must know why. Otherwise the talk show hosts will eat you alive.
Most authors worry too much about the title up front.
Unless Archangel Gabriel personally commands that your book will be called, Around the Horn, or whatever, just pick a working title for now and get on with writing. The final title will come from your subconscious later, from a publisher, or from the book itself. When title does become an issue, trust the professionals. They know what sells and what turns prospective readers off. They've been done to death and should be retired.