You are a bit late to this discussion, ozdevil, so I will try (and fail) to be brief in an explanation.
Some people think it's ok to have more than one account so they can go back to the easier tiers (Hack, Amat. and Pro) to try to win the credits for those tournaments... even though their skills are much better than the people that belong on those tiers.
These people are liars, cheats and thieves, and are the bane of all decent people who play this game for fun and companionship.
Were I given the opportunity to change one rule in the Terms & Conditions of this game/website, I would write in big bold letters at the top of every page...
"Anyone caught with more than one account will have ALL accounts subsequently disabled and deleted with complete forfieture of all monies spent, virtual equipment purchased, and all credits won or bought. In addition, said CHEATER'S IP address is permanently banned!"
But, that's just me.