Everyday I get on these forums looking for an answer to this specific question and it never comes up.
Why doesnt the ai build farms?
This game gets rediculously easy because the lack of population makes the ai poor and very easy to invade. All you have to do is cut off their trade and hurt their influence and they go broke. I was playing on tough, large map, all ai's with only 3 planets (bad corner start) and I was able to pass up the drengin in population. They had 12 planets.
For me, this issue is huge...even bigger then the social production and fleet problems. In that game I should have been annihilated because I only had 3 planets, yet I was still able to keep up. I think the AI in this game is incredible but the small popluation is really holding it back. Not only should I have been eliminated, but I wanted to be. The current replayability of this game continually decreases for me because this is just too easy to exploit (invasion, selling off farming techs, come from behind wins that shouldn't have been possible, etc). If I'm losing I want to lose...its fun trying to survive, but when the AI beats themself its really cheap and boring.
I've seen old screenshots where the ai had farms and I even saw an old post from gamma saying that the ai builds 4-5 farms on pq 9's...so where did they all go? I'd rather see the ai build too many farms then none at all...