Meh, how much does a regular old 15-20A 120V outlet cost to install? $200 per plug, maybe? Just need a relay inside that talks over Bluetooth to a cloud-connected app on the user's phone (or just city wifi), and you've got a smart outlet that can handle payment. Another $20 (based on costs I've seen online for similar products), total $220. People can use their own chargers as all electric cars come with level 1 chargers. Cost is low, so could use residential electricity rates (slightly more expensive than commercial) and still make profit.

We already have lighted parking, don't see why adding outlets is that hard. We're talking slow overnight charging here for the most part.