For those who make money with their cameras as opposed to people who shoot for a hobby. I know that photojournalists don't necessarily need a full frame camera but what about you commercial shooters? How big a print can you go with say a Canon 40D vw a 5D?? How often do you wish you had a full frame camera if you don't own one now? I'm on the fence between buying a 40D and 5D. My goal is to make money with the camera down the road.