Well, since questing (and dungeons) are supposed to be part of the map, why not do something similar as player creations in-game to protect what is valuable to each other from those who would steal it?  I mean if the player is going to be a physical unit on the map, why not his treasury and magical item inventory as well?  And if his treasury and magical item inventory are on the map, others will want to take it (enter their heroes adventuring for riches), so the player will want to devise ways to protect it.

That seems to be fundamentally different from what lwarmonger suggested. Given that the current plan is to have resource flows packaged in specific, vulnerable map units, I think it is a swell idea to make your faction's treasury work the same way, and any stash of unassigned magic items you might have. Depending on how complex you can make your economy, there could be another interesting set of Big Decisions based on keeping your treasury well-secured and keeping enough coins in easy range of where you want to spend them.

And I really, really like the idea of being able to be a stupid channeler and go wandering off on some snark hunt only to come home and find you've been made penniless because you did not properly garrison the site of your treasury.