"and the only way I see it making a lot of sense is on billboards/buses/and commercials (quick ads that people don't have time to take the number down),"
You're two years too late...he chose to advertise in the Des Moines Thrifty Nickel instead. He's a "Marketing Guru" I'm told.
P.S. GoBox works on a Mac...it's irrelevant to what's going on here though.