I added this text to the server documentation a little while ago. It's online, but not in the current release docs.
Whilst running the server with the default maprot is the easiest/safest option, I would prefer to see more servers running maprots with non-official maps, but this is just my personal opinion.
Quote:...Do not use the maprot file to force the same map or mode repeatedly. Servers with map rotations containing less than two different maps (or three if they are all the same mode) may be removed from the public server list...That's the only restriction that I impose when I'm removing a server on the basis of its maprot.
Whilst running the server with the default maprot is the easiest/safest option, I would prefer to see more servers running maprots with non-official maps, but this is just my personal opinion.