When trading techs, both in crippling and masochistic, there's an issue with values. Example: AI player has Harpoon and Harpoon II. I try to trade for Harpoon. It's veeery expensive (i.e. harpoon's value is high). If I include Harpoon II, instead of having to trade 15 techs, I now can trade two cheap techs or simply a couple hundred bc. I'm guessing when adding a second weapon tech of the same category/type/tree, it's munging the value.