Here's an example, I am left handed and when I mount a gun I want the stock to angle away from my face. Nothing worse than having a stock that angles into your face and you are sure to get excessive recoil to the face and eventually start lifting your face as you pull the trigger in order to get away from the recoil. I have had one adjustable stock in 41 years of shooting. The gun came with right hand cast, and I am left handed. I had the gunsmith, bend the stock cast left, then added the adjustable comb. Reason I did this, is due to if I just moved the comb over to the left I get hit with the bottom ridge of the stock to my face and it is very uncomfortable. If I didn't bend the stock originally, I would have had to sand down that edge when the stock comb was moved over.
"Right" handed people have no clue what we "correct handed" persons go thru on a daily basis..Most everything is made "right-handed". Like Steve said- better to have the stock made or bent left-handed in the first place.
shutnlar- Benelli and Fabarm both make LH semi-autos, as did Winchester in the 1400.
There are very few people out there that a completely neutral stock will fit correctly, right handers or left handers. Why do you think a lot of people who can afford to do so, have a custom stock made, or shoot a precision fit stock? It isn't to flush money down the drain. If you have a neutral stock, and "think" it fits you, I suggest you see a competent stock fitter, as you are probably wrong. The only way you could shoot a neutral stock, and have your eyes level on the X axis would be to have a razor thin comb, and eyes that were very far apart.
And no, an adjustable comb and adjustable pad CANNOT get you the same effect as true offset and toe out built into a stock, otherwise everyone whos ever had a custom stock made would just be shooting factory stocks with adjustable combs and pads. I shoot a comb thats 1/2" offset from the centerline of the barrels. If I were to take a neutral stock, and move the comb over a half inch, my jaw would be bashed in by the comb cut every time I shot the gun.