I actually carry TWO of my own knives every day..... a Mosaic damascus EBK-II, and a mosaic damascus utility folder, based on my Progression II design.
I personally feel that carrying one of your own knives is the best way to sell them. (I can't count the number of knives I've sold out of my pocket or off my belt) It also speaks to the fact that your not only a knifemaker, but a knife user, which tends to make me believe that an individual who carries their own, has likely used them, and has a better insight into what works, and what does not, than someone who doesn't use their own product.