Do not submit a manuscript until you are certain there are no spelling, grammar or punctuation errors. An agent may reject it on that basis. I think this absolutely correct, goal-wise, and absolutely unlikely to be achieved. First, does anyone honestly believe that an agent would say “This novel has great commercial potential. Wait, what? A misplaced comma on page 100? Into the trash!” And let us also remember the opening line of Bubbles, Beverly Sill’s autobiography. “When I was only three, and still named Belle Miriam Silverman, I sang my first aria in pubic.” Can you find the mistake? It’s a seriously awful one, and no editor caught it.