It also needs to be useful on a relatively regular basis otherwise there's a dissonance between added value and the additional cost. For these shoes to be useful you need to be walking somewhere you don't know the way to, without someone with you who knows the way with you, for a distance that makes you not want to take your phone out to check you're going the right way occasionally. I don't think I've been in that situation for about 10 years.

If you're a courier or a messenger then these would be fantastically useful. For everyone else, they solve a problem no one really has.