My Dad taught me how to sharpen an edge. Once he did, guess who sharpened his knife, axes, and shovels. It wasn't because he didn't know how. Even as an adult when I visited him, I knew to take my stones because I knew he'd hand me his knife to sharpen. He kept a good edge on his knife, but he'd still have me do it for the same reason he'd pay a shop to change the oil and filter in his car.
Personally, I won't let another person put a stone to the edge of any blade I own, whether free or for a price.
Personally, I won't let another person put a stone to the edge of any blade I own, whether free or for a price.