Compare It To What Humans Would Have Done In The Same Time Period
Yes they cost a lot more. They would have gotten a hell of a lot more done too. We would have inspected the bedrock on day one outside the airlock and crossed to it in a matter of minutes. A human pilot could have probably intentionally landed near bedrock or at least in/near a small crater.
Robots are precursers and aides not substitutes.
Regards,
Mark
