If micro transactions break into public awareness it might get significantly better. There could be a joint meter app like mint to track usage. You could just sort by a few things like recent cash flow and trivially manage your transactions at scale. Transactions should be tied directly to user level constructs like playing a song or a period of time in a game. These should have consistent costs so that the user can form reasonable expectations without needing to sign off on every transaction. You don't think about how much water costs every time you use the faucet but you're aware enough not to just leave it on. That's the only mental cost that's ultimately necessary.

What about https://news.ycombinator.com/item?id=9453821 then ?