Board Thread:Event Community Discussion/@comment-28069733-20170514083426/@comment-26574811-20170514143807

Hyper Shinchan wrote: Vcharng wrote: Having something or not is a matter of quality, while displacement is a matter of quantity, plus being the most oftenly broken rule in the treaty. Even speed regulations received more respect. Quality is a direct function of displacement in ships, fitting a triple torpedo tubes is relatively inexpensive in comparison to what you gain from a 70% increased displacement, you can basically put them in place of a main gun (there was a plan for an amphibious support DE with three 127mm single guns) or a quadruple Bofors (which is what was historically done).

The tubes are not, but torpedoes are very, very, very expensive. An aerial torpedo (which is the smallest of all torpedoes) is usually more expensive than the aircraft that drops it, that is, more than 100,000 USD in 1942, or about 1/200 of a fleet carrier (excluding the aircrafts), an insane price for an ammunition.

And since it's so expensive to use, the intended role of a warship is something you need to think carefully when deciding whether to fit with torps or not.