RE the charger, that problem has mostly been papered over because people are willing to pay a decent amount over the cost ceiling for this kind of service (China you can pay $1 or so to rent a battery charger, and that's way more than the cost of the electricity).

Though the idea of even jokingly giving miniscule amounts of money to friends has some traction in stuff like WeChat. If the systems were more open then you could run a collection system on your site pretty easily.