Does this mean it could make sense to buy a subsidized PHEV and literally never charge it?
You could, plenty of people do (based on used Volt lifetime fuel economy values), but it's still pretty stupid. I think they're mostly "company cars" that have a gas card. It still gets the tax credit, but I've no idea why you'd do that sort of thing on purpose.
My point was to observe that public paid charging is obscene. If I charge at home, that 10kWh/35 miles is $1, vs $2.[whatever gas is right now]. It's less than half the energy cost, before getting into extended oil change intervals and such.
If you're never going to charge it, you're better off with a pure hybrid (Prius or such), over a PHEV. The pure hybrids tend to get better fuel economy on the gas engine. They're lighter than a PHEV, and typically have somewhat fancier engines. The Gen 1 Volt gets about 35mpg on gas, the Priuses are up in the mid-50s in the same conditions. However, since we plug in regularly, our actual fuel burn is about 25% what a Prius would burn for our driving (miles per gallon gas used since we got the car is up around 200 - it's not a straight up mpg comparison because it uses electricity).
I think the town is getting its money's worth even while making the charging free. However, in general free is a terrible price because it distorts behavior. I certainly could charge more at home and still be saving significantly compared to buying gas, but this extra savings, plus the nice walk, plus enjoying getting something for free, makes it worthwhile to me.
Would you still do it as much if it were only a 3.8kW charger? I feel like that's a good middle - cheap to implement, and just a hair annoying if you're trying to fully charge a BEV from it, which I'm fine with for free infrastructure.
...but currently it probably makes sense to keep it free since the demand is still fairly low and the capital cost of a "dumb" plug is much lower than a unit that can deal with billing.
But the difference between a dumb EVSE and a billing-capable one is so massive that they'd be better off just running more circuits and putting in more dumb chargers.
A single outlet Chargepoint is around $5k (found some pricing), the dual outlet ones are about $7k. Plus wiring.
Interestingly, just before COVID hit, the free chargers were occupied more and more often so it was getting hard to score one. That's a sign that it's time to start charging.
Or just add more. I really don't think "Putting in expensive units, then paying the monthly management fee, before anyone passes a single expensive kWh" is the right path. You'll drop use, certainly, but it will end up costing more in the end, for radically less utilization. People like me (3.3kW charging) simply do not charge at any of those stations in public. I'll burn gas instead at a third the cost, and with the longer range BEVs, they don't charge either. The market for those is roughly "Leafs that got caught short and have to charge." That's a far smaller market than "Anyone with an EV who happens to be shopping."
When you have to pay to charge, the system that's installed makes a big difference. There's a mall nearby that used to have six EV charging spots with ChargePoint stations. They were still free but the infrastructure was in place for them to start charging for the service any time. For some reason the mall switched to another model that nobody seems to be able to make work (crappy mobile app, etc.) and now those same spots are pretty much always empty even though it's still free to charge, assuming you can make the app work.
So they've spent a ton of money (twice!) compared to dumb charging points, and they still don't work or get used. Seems dumb to me.
The ideal is that any charging station "handshakes" with your car when you plug it in and makes the billing process seamless, but so far that seems limited to Tesla's superchargers. Perhaps others like BCHydro's fast chargers or Electrify America/Canada do that, but I've never tried either of those.
AC charging doesn't really have a great way to do that over the J1772 port, and most EVs don't have the car-side communication ability to handle that anyway. DC fast charging has the option, though I'm not sure how frequently it's used. Most people seem dead set on implementing ISO 15118, which... I have my opinions on, none of them particularly high.
Incidentally, I've never seen the need to use anything beyond 120V at home, so no expensive electrical work needed. If I were to plug in as soon as I got home I could add over 80km range for the next day but my round-trip commute is only 50km. If I ever need to charge faster there are multiple options within a few km of me.
The main advantage of 240V at home (and it's easy to swap a 120V circuit over to 240V, if you disconnect the other outlets or switch them for 240V outlets) is that on most EVs, the charging efficiency is higher. The converters are a bit more efficient, and you don't spend nearly as much of the transmitted energy heating the pack (percentage-wise). On a 1440W charging budget, in the cold, 500+W of that can go to just pack heating to maintain charging temperatures. On 240V, the same power going to heat the pack is a far lower percentage. It's not a big deal, and 120V charging works well for a lot of people, but going from 120V/12A to 240V/16A (or even 240V/12A, as some included chargers let you do) is a nice jump.