i think another important psychological motivation for having all this on a laptop that i can quickly turn on and off, is similar to the motivation in having a small desk somewhere in your house where you go sit and pay bills -- which many people have.
i'm just thinking that it can serve to separate the activity mentally, so that when it's time to go pay bills i physically go over to the secure laptop, do that, close it and get back to regular work. there may be a psychological advantage to making the two activities physically separate.