Anybody that has multiple nations should only keep one. Any player caught with multiple nations will be deleted and banned by the Cybernations' moderators/administration.
Any nations that log in from the same I.P address will also be deleted/banned by CN.
This is apart of the game terms. As a CN alliance, we cannot go against them. It's not fun to invest in a nation that gets banned by admins anyway.
You may read up on the terms here:
http://www.cybernations.net/terms.asp