Quote Originally Posted by zbest View Post
I think it's a matter of honor. When you've got none, and you're reinforcing those that do, then it seems to happen more.

Apparently, it doesn't happen if there's a hero present.

( all reinforcing missions should have one anyways )
It's the prestige difference from a lower prestige player to a higher prestige player. It was designed to prevent multi accounts supplying the main character which usually has the higher prestige. If the prestige are within a certain range there won't be a robbery.

I am not sure about sending with a hero. I hope you are right though.