Real Book Players
Here's a nice article about NOT being a real book player.
Honestly if you don't mind. To me a realbook is the sign of one of a few things.
1. A pro doesn't know a tune and he's reading it because he has to.
2. It's a student who doesn't know enough tunes. (that's fine).
3. It's an amateur. Also fine.
Anyway this article sums it up perfectly!