Yes, and no…
No, in that I do believe that books of deeds are intended to be crafted. But, yes, in that they are meant to be very rarely crafted and extremely expensive to do so.
At some point everyone will have their kingdoms at Level 15, which means that individual deeds will no longer be used to level up those kingdoms. So, they have to go somewhere, else they become the next Orbs of Growth.
Also, I’m fairly sure that this recipe is meant to be a a large economic gem sink for the game. As players’ tributes keep increasing, those gems have to flow somewhere. That’s what the Daily Deal board is meant to be for endgamers.
But, at current rates, 50 deeds at (300 gems per 2 deeds) = (300 * 25) = 7500 gems per book of deeds. Not sure how I feel about a single book of deeds being valued in the upper end of the range of a mythic troop, though. Prices on things in-game are intentionally meant to be very steep, but that price is a tough pill to swallow.