Not only is proper use of the camera essential, but I will go so far as to say what camera you actually use is just as important.

I have used the Cuddeback flash cameras, Bushnell Flash and am now using 4 Moultrie I40s. I can tell you that I will never buy another I40 again. I have never had so many deer looking at the camera and know its there as I have with this camera. Its too loud.

While in Illinois we set an I40up on a scrape, just to see what was visiting it. Over the 10 days we were there, we checked it 3 times. The first time we had quite a few pics of different bucks on it and each time after, less and less. We sat in a stand about 100 yards from it a few days and could see the camera. On one occasion we watched a buck walk up almost to it and stop. He looked right at the camera and then quickly walked past it. He knew it was there. Scent wasn't the issue, it was the camera itself.

So, as much as proper use of the camera is important, so is the type and brand of camera. IMHO.