> In short, it's not consumers who want robots to buy for them, it's producers who want robots to buy from them using consumers dollars.

This. Humans are lazy and often don’t provide enough data on exactly what they are looking for when shopping online. In contrast, Agents can ask follow up questions and provide a lot more contextual data to the producers, along with the history of past purchases, derived personal info, and more. I’d not be surprised if this info is consumed to offer dynamic pricing in e-commerce. We already see dynamic pricing being employed by travel apps (airfare/uber).