It is most certainly not a small investment. Especially considering how few it will benefit.

> I suppose they could allow a monthly lease of a reserved charging station, though.

That's usually how it's done here. And the cost is not negligible at all, more than what I pay in gas each month. And on top of that you pay for the electricity of course. And I'd say that most apartments that even have parking associated with them you will often need to wait years and years to even get a spot (electric or not).