I used to have a similar rule about dating coworkers. I found that I was actually turning away too many perfect women just because I worked with them.
I broke with the rule, has a few nasty, bad idea dates, and re-instituted the policy again. After I left that job, I met my wife, whom I had worked with, but didn't know it. In hindsight, I would have been much happier if I started dating her when we worked together.
In other words - rules that exclude a portion of the population are dumb. Don't want to be the Airport Pass-Around girl, don't go out and **** the entire flight line. But if someone happens to be a really good fit for you, and they're a pilot (FYI - its quite possible that as a pilot yourself, you'd get along GREAT with another pilot), turning them down based on that will lead to a life of loneliness, and certainly feels more like "settling" than dating a dude with some issues is.
Unsolicited advice done.