Because the world is MASSIVE you're a lot safer than you would think on face value. Even IF you were walking through your mansion showing off gold piles a player would need to be in your town/area. While possible, its not going to be the case 95% of the time. You wouldn't want to do that anyway. Turn off the stream as you set up your OPC and go home.
Also its worth noting that if you got any evidence or footage of them you've just caught them in the act. Theyre basically screwed because everyone that can is gunna try to stop them for rewards as well as getting rid of them.