Piqué Polo with Heart Appliqué

If you've noticed, this lone gray polo of Comme des Garcon is more expensive than it's blue, black and white counterparts. But why? I purchased this along with some of the other colors to see if I could see any difference in them, but I can't find any. As far as the shirts themselves, I like the fit, they are on the trim side, but are more or less pretty accurate on size. They are stylish and can be casual with jeans. One recommendation is never to put them in the dryer!