When lunar tourist flights are routine you will be able to afford to take the a scientist along. However for now you need PAYING customers, not freeloaders. This is a business model, not a charity service or government entitlement.

Once the volume of flights (and the vehicle size) increase you might be able to able to afford to take a token scientist or two along who are willing to work off their fare by giving lectures like those that now go on Antarctic cruise ships...

For now any scientist that wants to go should be required to pay full fare.

Hmmm, maybe some wealthy unviersty will pass the hat among alumni to send one. Should be no different then raising donations for the sports program at a school.