I think to probe the OPs question deeper: while it's not uncommon to see double toe straps on the pedals of, say, a match sprinter's bike being raced on a velodrome, why do people use them on the road, especially if they clearly are not racing or training, wearing Puma Sambas, and carving in and out of midtown traffic. Yes, it seems the question is geared (no pun intended) not towards serious racers, but rather, those who ride fixies for purposes such as messengering.