You make a interesting point. I attended a few crypto events and seminars in my newbie days, and this is why I think it is difficult to target people who attend these events. Not everyone who attends a bitcoin conference has bitcoins, they may be a newbie who is simply just interested in bitcoin or someone who is just there to network. It’s difficult to tell who is who in these events, but if I’m certain you have $10k bitcoins in your wallet, then you definitely have a target on your back.