You've obviously never had your iPhone containing all your personal information stolen. I hope you never do. It's a very terrible event.
Agree ^^^
We're not just talking about just getting mugged for $200 - and that's bad enough. (I was mugged for $65 and a cheap watch - and that was no fun! Scared the living *****t out of me.) All the information contained in the phone, and the potential for accessing credit card and bank accounts make this much more financially costly - not to mention the trauma of being robbed.
Many of the suggestions above might help kill the market for this kind of theft.
Of course, the scumbags out there among us will find something else for which to mug you, but any discouragement is better than nothing.