@clacke @sim Best quote ever, really.
Just to point one thing out:
"We do have to fight human nature here... as a general rule, the path of least resistance is most likely to be used(...)"
See the contradiction? Fight human nature vs. path of least resistance.
Hence, I think the trick is to find ways that can (technically) incentivize good behavior, while making it convenient enough for the user, and offer a more cost-efficient way of doing things.