Thanks for this analysis, Richard! I think the even bigger issue that people almost never consider is that one of the biggest costs of owning a gas motorcycle is the major servicing, and Zero's have no valves to adjust, no fluids to change, no reason to take the bike apart every 6 to 12 thousand miles unless something goes wrong. Not sure how the math works out on that per mile, but it's got to be close to the fuel costs if not greater.
For me, going electric was something I always wanted to do, but I'm not sure if it will save me any money even though I came in at a low price. I was riding a 2011 Ducati Multistrada that I picked up for an astonishing $5,500. It's not great on gas, but my local trips are all by bicycle so I only ride it to go out of town about once per week. The major services on Ducati's are infamous, but it was 10k miles away and it was going to take me a long time to reach it. Given what I paid, I could have held onto it for several years without it depreciating past my purchase price. I currently have it listed for sale at $9,000 and hope to get $8,500 (or at least $8,000).
The Zero cost me $7,500, which was also a very good price but not necessarily priced under market given that it has 45,000 miles on it, so I'll only be able to sell it for the same or less. I use my neighbor's spare charger and pay them $15 / month and something on the order of $.30 / kWh. Given how few miles I ride, gas wasn't going to cost me much more than that on a monthly basis. Psychologically I do feel like my Zero miles are more guilt-free given that it gets ~350 MPGe on the highway, but the actual dollar savings are pretty negligible. So I'll likely be ahead of the Ducati on the servicing but behind on the depreciation. It's basically a wash financially.
I definitely appreciate the low-drama aspect of electric and will never go back to gas. Even things like filtering up to the front of a line of traffic feel much safer and more natural on an electric since I can't kill the engine by emergency braking if some jackass on their phone changes lanes in front of me and I forget to pull in the clutch. I just wish I could have some of the refinement of the Multistrada on my Zero. Oh well, can't have everything! Maybe in a few years Energica will make a sport-tourer or the aftermarket for their bikes will catch up to what's available on the S-platform Zero's.