Solid Missile Fuel - I agree that it started very unprofitable, but I had thought this was based on the added supply and the low price of it. For this reason, I actually bought up the entire amount of the extra supply (20 million units) one month in order to trade it later for more money. My investment is paying off, as the price has since about doubled.
That said, my 3 solid missile fuel corporations that I just checked all lost over 4.5 billion last month. None of them have shown signs of being profitable and all are at 160 quality.
In fact, when I worked it out, I found the following:
Price: 10,761 SC$ per unit
Units produced: 179,798
Quality: 208.6
Income if all items sold at market price x quality: 4,036,005,895.908 (about 4 billion)
My expenses (with nothing sold) are: 4,527.55M SC$ (about 4.5 billion)
This is with solid missile fuel at $10,761, or $