I suspect you are reacting to our photo contest and all the talk about digital editing.
Using photoshop to hide flaws in a knife for sale or otherwise intentionally or even unintentionally to misrepresent a knife for sale is fraud. When buying anything from a picture, caveat emptor. I'm with you on having a problem with intentional image manipulation to deceive a buyer. I am sure it happens -- often. The upside is most crooks aren't smart enough or are too lazy to learn photo editing software to do this. Those that do practice this type of deception are soon found out.
On the other hand, digital images do not represent what we actually see accurately. Photoshop helps adjust color, lighting, saturation, contrast, sharpness that the human eye would see but the camera doesn't do as well recording. Correcting or enhancing an image to better represent what we would see with our own eyes is something I don't have any problem with. I prefer it.
Editing an image to the point it leaves reality and becomes art also happens often. I like those also. We are surrounded by edited images constantly. I wouldn't have it any other way.