Actually... sometimes not. Depends on the camera, depends on the scanner. One of the guys that regularly gives me side art & marquees only uses a camera. A camera with mega mega pixels, but a camera nonetheless. His shots are better than most of the scans that I get. If a cabinet is well lit, and the camera has a good resolution, you can capture some great stuff.
The margin of error with a camera for a novice is much greater, however.