Why does it seem that supply and demand doesn't apply to southpaws?

1 in 9 people are left-handed. But you would never know that when shopping. Why is it that I have such a difficult time finding scissors, a manual can opener, or a travel mug that’s designed for lefties? I even have trouble finding a baseball glove I like. Sure, they sell those at sporting goods stores but the selection is always lacking. Same goes for left-handed golf putters.
And, dammit. I want my lefty bowling shoes. What gives?