How do I judge whether a store pack is worth its price in Dragonfire?

Before buying a pack, ask yourself three simple questions to avoid the "great deal" that isn't:

1. Is it permanent or consumable? A permanent gain (Lifetime Third Builder €9.99, a Star Rank) survives Reigns; a consumable (Cores, Meat, speed-ups) disappears when used.
2. Does it serve a dragon I ACTUALLY play? A €17.99 Legendary outside your army affinities doesn't help.
3. Would I have bought it WITHOUT the promo / the timer? If not, it's the artificial urgency deciding, not you.

Neutral rule: a pack is only "worth it" relative to your plan, not to the bonus percentage on the banner. The best gold-per-euro ratio is still the first-purchase bonus (2x gold), but only if you were going to spend anyway.