how does it make any difference to the quality of the designs other than to stop people entering the contest later on who have genius ideas but the CH cant see them because the contest is full?
im really struggling to see the logic behind it.
keep in mind that almost every concept entered by a designer = 5+ entries of variations on that same design.
sometimes many more, ive done over 60 variations on the one design before (due to back and forth communication with the CH)
while its a bit silly that some people post 20 variations straight up without being asked, its not really a problem, it only takes the CH ten seconds to bin them all =)