I think there is some kind of default penalty for roster violations. Something about 500k...i don't know.
Personally I think clones are just a cosmetic issue. You're really just drafting a set of numbers with a name attatched to them, so I don't think the quality of the game play is affected (effected?) in any way. No unfair advatage talent wise, just bad cosmetics. So, as Uncle Al said, your best bet is to ignore the name for the time being and simply not join his leagues any more.