[cooper12]

Not really, there are some situations where the deal is too heavily skewed for it to be favorable for you. In human terms "I'm not willing to pay this much for this". What AI might actually consider bugs would be stuff like politeness or pity (I can't refuse to buy from this small hungry child), basically things external to the actual process of negotiation, but that might have considerable impact on human agents and how they would feel afterwards. (for example giving money to a beggar is a one-way act, but the donor will likely feel good about themselves despite not getting any material gains) Similarly, people might purposefully adjust their tactics depending on the status of who they are negotiating with, making more concessions with family and friends. If the AI just looks at the inherent value of the items, it'll miss things like that.