I know but I don't like skipping goals and I like to spend the gems I have on new things. I'd rather have a mithril dragon or a living wood tree. Besides, if the first step is 5 inscriptions then I hate to think what might come next... 100 gems might be the beginning of a slippery slope.
Anyway, it's all personal as to how you like to play the game. Me, I am frugal with my gems.