AI has poor judgement on Tech value
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I was playing on Intelligentlevel near the end of the game. I was on my way to a cultural victory, but noticed that the Altarians were way ahead of me in research. They had a whole bunch of techs including near omnipotence. I was on Friendly terms with them, and around even standing in diplomacy (maybe a slight edge). So I made a deal to buy all their techs: Near Omniscience, Near Omnipotence, and most of the 4D stuff all for 5600bc over 5 turns. FIVE TURNS!! So basically, if I shut down my producution for five turns (my economy produced 5500 bc per turn at that stage), I could get all the techs that would normally take me 40-50 turns to complete had I devoted 100% to research.