I just did some maths to compare the value of the different rewards given for accomplishing Gobber’s tasks (60 raw amber or 15 runes), and to show how truly pitiful the raw amber is currently doled out in the game.
For Legendary dragons, assuming you had none of the items for any of the first six legendaries and you wanted to buy them with runes, you’d need 175,000 runes. Using Gobber’s tasks as a measuring stick, you would need to accomplish 11,667 of those tasks.
Now for the Shellfire, we are asked to spend at the very least 1,510 polished amber to unlock it. Still using Gobber’s tasks for comparison purposes, you would need to accomplish 25,167 of those tasks.
So essentially the base asking price for the Shellfire in terms of in-game resources is more than twice as much as for the other dragons.
The big difference, however, is that we can search for the usual collection items to unlock legendary dragons. For the Shellfire, we’re stuck with Gobber’s rewards, whatever the other unlocked legendaries bring back, a few calendar gifts, releasing dragons, and some Gauntlet rewards.
Here’s another example of how raw amber is treated in this game: my current game’s 1$ offer is Torch, along with 1,792 runes, 216 Odin coins, and a whole 431 raw amber, or less than half of a polished amber. How is that even close to equivalent amounts of resources? 1,792 runes can get you a long way in the game, it’s even enough to outright buy some dragons, unlock training spots, or new islands. What can 431 raw amber get you?