Congratulations on the launch - I had a question though - what if people aren't carrying the stuff they are selling ON them at that time - then it's pointless

Congratulations on the launch - I had a question though - what if people aren't carrying the stuff they are selling ON them at that time - then it's pointless right? (this is in a regular scenario and not a yard sale) Wouldn't it be much easier to just look for everyone selling an iPhone 5 in my suburb.