That's easy: there are too darned many of us. I just returned from Magna Cum Murder, which is a small con. Attending cons, while a lot of fun, always underscores how many people are out there writing mysteries--and a lot of them a pretty good at it. One man at an informal discussion said it out loud, "I know I'm as good as a lot of the best-selling authors, but I just can't get recognized." It's…