I think they think about this the same way they think about their returns policy: They just assume that most people will be reasonable, and not go out of their

I think they think about this the same way they think about their returns policy: They just assume that most people will be reasonable, and not go out of their way to abuse the system. On a tangential note, I seem to notice more and more how this pattern of just trusting people seems to win out in all kinds of fields, even though it seems non-intuitive. Wikipedia is another example and in a sense the whole open source phenomenon is based on this. Both of these would have been considered preposterous until they succeeded and completely changed the world.