I don't believe anyone has said, "Mars or Bust!". The only way we get to Mars is through our experiences on the Moon.
Robots can do the science, and 1% of the cost.
Have you ever looked at a photo of an outcrop, and then visited one? Ever looked at an image of a quartz crystal, and then held one in your hands? Bit of a difference, wouldn't you say? Several formations I have run into out in the field were initially identified on the basis of smell. Certain rocks can be identified by feel alone. Geomorphologists and structural geologists put together the history of a region by what they discover based on field observations. These are things that are all lost without the human component.
Yawn. Try harder.