Oh man, this thread is going to be funny.
Some people claim to rock fronts for aerodynamic but then will be wearing jeans, a baggy jacket, and have a huge bag on. Since aerojokes are allegedly "bombproof" it would make much more sense to run them in the rear, since thats the wheel that will take the beating, but very few people seem to do that. It basically boils down to aesthetics on the street since the weight and aero benefits are usually quickly negated by somethings else the rider is doing.