I'm a bit excited about the advertising possibilities - I know it is a bit creepy, but if an ad company knew what I spent money on (generally), my shopping habi

I'm a bit excited about the advertising possibilities - I know it is a bit creepy, but if an ad company knew what I spent money on (generally), my shopping habits, and where I am, then I'd expect extremely relevant ads that would be interesting & useful. (This is coming from someone who actually likes advertising when it's targeted) Obviously security would be a massive thing for this - I'd see it useful for things like Starbucks, but I wouldn't really want to have it authorized for anything over say $50