Is the Lifetime Third Builder offer at €9.99 worth it in Dragonfire?

The Lifetime Third Builder is sold in the store for €9.99. By default you have 2 builders (2 build queues in parallel); this pack adds a permanent third.

Why it's the purchase most often called "worth it":

• It's permanent (paid once, kept forever)
• It speeds up all of your Stronghold/economy progression, continuously
• The comfort gain is felt every single day you play

To keep in perspective: it's a speed gain, not direct combat power. If you play very little, the value drops. Neutral information: among the store's offers, it's the one whose benefit lasts longest, because it never resets and helps your whole base.