Well, i grew up thoroughly confused...because I was ambidextrous...I "wanted" to do some things left handed (like shoot a bow or gun), others I did left handed (intricate, or very dextrous operations).
But, I even succumbed to the masses, and learned to shot both a bow and a gun right handed, simply because you could find many, many more choices that way.
So for 35 years, I've shot right handed. And I'm left eye dominant (I think) as well, so I close my left eye when I shoot (knowing that that's not really proper, but it works).
My best shooting buddy if a "true" lefty, and while it causes some problems, but he addapts pretty well, and can shoot my guns pretty accurate.
In short, I think left handed gunas are a bit scarce, because so many people have learned to adapt, not because they are a significant # of "lefties" out there. While the #age may be 10+% many, if not most, have adapted, lowering the demand even further.