It also gets your customer service moved up the food chain. By keeping someone working, you help the shop. Local shop has a young guy / late 20's, who works in the afternoons, driving the van and trailer around. Machine pick-up's, and deliveries. When he's in the shop, he goes straight to the sharpener bench. He takes his time, and is getting better. His sharpened chains are mirror-like. He will also firmly tell the customer, "this chain is beyond sharpening/ its junk". His work has value, as does his desire to do it right. He'll sell you a box of files, and hand guide, and show you how to practice. This Guy is willing to lose his job, to keep it.
Deal with your local shop, regularly. The savings are in the costly stuff. The true value is in being considered, "A Good Customer".