Why are Sages fair? Opinions wanted!

[Chazar]

johan osterman said:
Chazar: Giving the Sages 40 reource cost would be a little at odds with the rest of the game. Reource cost on uniits reflect their equipment, heavy armor high resource cost.

Well, I am pretty aware of that (see my post in this thread below/above), but I cannot think of any other reason why this would be a bad idea. I think this is similar to Kristoffer O's argument in the discussion about province size. So it's merely a task of coming up with a sound explanation if the game mechanics work out fine...

What I really want, similiar to what I said with a twinkling eye a post ago about the aged sages, is that one could only recruit one sage every other turn, or maybe only one sage per season.

Maybe there are even more troops that can only recruited in a certain season anyway (some sacred units can only be recruited at a certain festival point - equinox, solstice, moon position,etc.)