You guys did a fantastic job of side stepping his questions and airing your thoughts on politics. I will answer as best I can from a consumer's side as I do repairs, but not as a repair facility. The electrics offer a lot to the consumer. No gas, no oil, very quiet and light weight and virtually no maintenance other than keeping it charged and clean. I have repaired a couple and it's normal things like tires, safety switches, blades, etc. The down side is the batteries will wear out, or you'll desire a second one to allow more cutting time. As said, they are costly to purchase afterwards, but I would imagine most will purchase off line unless it's needed quickly.
One other thought, for users that are used to washing the deck underside, you can't do that with the wlk behinds, it burns out the motors. If I were a shop, I would stock everyday things like blades and a few batteries. You would have to research which machines are the most common.