Why dreadnought fleets were worth the cost

Were the dreadnoughts worth the money, and what did they accomplish?

Yes; they were the era's necessary heavy fighting ships, and greater numbers gave a navy more tactical and operational flexibility.

Dreadnought battleships and battlecruisers were the heavy warships available to contest the decisive naval battles of their era. Their value did not depend on every ship firing in a famous engagement. A larger inventory increased tactical options at sea. It also provided operational flexibility across deployments, deterrence duties, refits, and emergencies.