The fact that your treasury GAINS money when you capture ships seems historically incorrect to me. In the Royal Navy, when a Naval vessel would capture an enemy warship then the government would buy the ship and add it to the navy. The money paid by the government would be divided up between the commanding admiral, the captain, officers, and crew of the ship. It COST the government money to do this. The money obtained from the capture of the ship went to those who captured it, not the government. Still, in terms of game mechanics I guess it makes sense, since it gives you a reason to try and capture ships rather than just blowing them out of the water.