I'm sorry, but although you have had success in selling images, I do not agree with your blanket philosophy on sharpening and with the greatest respect few would.
Far better to take in RAW, any sharpening can be achieved post processing. Stan is absolutely correct and halo's and artifacts can be the demise of a good image.
As an example last week I was punished in a society photo competition for over sharpening as the judge used a loupe to examine close up detail and that was my loss. It was an old image I took at least 5 years ago and when I was naive about the perils of sharpening.
Carry on as you see fit and you will be respected for it, but others be warned of the unwanted effects.