I have no idea how serious this guy is - but he wants to pay you for maps. I received an offer through the feedback system, listed below:

-- The following message was sent using the feedback page --

Hi

My Name is Ian Clark and I am doing a College business project using
Cube. This project will hopefull make money and I will continue to run
it after the class ends. I have been looking into the copyright issue
and it seems that most of the textures are or might be copyrighted. I
seem to have run across the same problem that some members of your
community have, that it is very diffucullt to tell what one can or
cannot use within cube. So what I am looking for are 4 or 5 Cube levels
suitalbe for 4-7 players (multiplayer) made with original textures, and
have an original look. I am willing to pay 50-100$ US each and it would
be for a non-exclusive commercial license meaning that the person would
just be giving me permission to use it. I know that it is not a lot but
at least it is some extra cash for their hard work. We are trying our
best not to rip off anything from cube, and customers will not have to
pay for the game we will make our profits with other methods. It is our
goal to make a business to bring cube and sauer to the next level and
give back as much as we can to the community.

Thank you for your time and if you could send some people my way, or put a post on the site I would be forever greatful

Thanks

Ian Clark