Actually what's to stop you grabbing the camera/phone off the selfie stick and legging it?
Imagine the tourist's indignation "He took my camera - lucky I had a firm grip on the selfie stick".
A moment's reflection.
Then "Hey, that's my camera/phone!".
Of course by that stage you're far away and still accelerating, with a nice camera or a new phone in your hot, sweaty grip.
Unless all the fat locals get in your way.