Hi all,
I think there's a flaw in the tech trading strategy if you choose to play with that option. One strategy is to buy new techs from alien civs, sell it to the others (you ALWAYS end up with a profit), while at the same time not giving away yours (especially techs that take ages to research). How about giving the AI this option too as it seems their techs can ALWAYS be bought, for the right price.
Thanks