So all the extra profit goes to the corporation?
I don't know the details or all of the real information but it isn't "extra" profit, it is simply: profit vs. much less profit depending on the region. It is either they can sell in one region or not. Take the Philippines and neighboring countries for example, they are very weak local economy yet very popular diving area. They had to lower their prices for that region to stay in the market. Some other countries that have better economies, Aus and NZ, benefited even though they have better economies. I don't have the full understanding nor the full information to be able to give you a better and more accurate picture, but SP isn't making a whole lot of "extra profit" in the US, it is just making less in other areas to stay in the market in these areas AFAIK.
SP is one of the, if not the, best managed big international dive equipment manufacturers in the world and they appear to know what they are doing. It is a profitable company in contrast to AL for example.