They are worth it if you get a GOOD QUALITY camera. By this I mean a camera that will accept different lenses, such as telephoto, ect. This will allow you to use different lenses for further shots, and also these type of camera's are the best on the market....
If you are looking for a general purpose camera, the cheaper ones are pretty good, but you won't get professional quality stuff with them....
And no matter what, you will still get better quality with an ordinary negative camera.....
If you get a digital camera, when you transfer the pics on to the comp. use tiff, or .psd formats. They will not degrade the quality, however, jpg, will....