No one needs to check 30 submissions, If one submission seems fishy, let's say a total noob made it who lacks gfx knowledge and it looked too good to be his, and is winning, and very familiar, usually someone will check if it's a ripoff, if it was in on the bottom of the vote and sucks anyways, there will be no need to check it in the first place
Believe me, If a ripoff makes it to the top three, it will be caught by either the host or a competitor then reported to a mod
You're just over thinking this.
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Two magic eraser clicks and I have a render.
It's not ripped off, it's still a render isn't it?
Either way as I stated this would be too much work for mods and it would decrease the value of the cyan names and 150x300 avatars regardless of how many there are.