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Doomsday devices do not fire automatically. They must be engaged by the ship's pilot. Because of their damage output, they do not fire as quickly as the base weapons in Eve Online. The changes to the Titans upped their damage for their preferred racial weapons. This change made up for the switch that made Eve Online's ultimate weapon single target devices.
The first alliance to use these awesome weapons was the now defunct Band of Brothers. (Goonsquad orchestrated the downfall of this alliance.) The large Sovereignty requirements has kept the number of these weapons in use down, and the cost for the ships and the weapons makes them prohibitively expensive. The isk cost alone keeps them in the hands of Alliances rather than single players.
Even players who follow a guide to getting a lot of isk may find it difficult to earn enough money to make the Titans. Eve Online's ultimate weapons cost almost as much to produce as the ships themselves do.