So who is stopping one dude in the pack have the app, some credit in it, swipe to open the door of the store, and it's gonna be followed by his 20 henchmen to robe the store blind while 2 of them will just block the door altogether to stay open?. 1000 USD iPhone X multiplied by at least 20 for each of them multiplied by 20 dudes it will make a nice 400k USD dent in under a minute. Have this happening at a few of these stores and you can see how that profit margin is going down the drain real fast.