Answered no. Even if someone succees to rob you, the amounts are too small to worry about it..
That's true... I think this answer closes the topic.
As sander said. I wasn't thinking about this.
Although ... I make to be able to rob only once at 5 minutes, and you can be robbed only once at 10 minutes. That's enough.
I decreased the possibility to be robbed. (=> more fail robbers like AliT
)