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Here is the reply I received from 99D.
"The rate of commission varies depending on the pricing level chosen when the contest is launched. On average, the split is approximately 70%/30% with the majority going to the designer. For your contest, you are correct -- the prize amount will be $200 for the winning designer."
In the case of this contest they are taking 33%. In my view that is excessive. However, since I don't work for 99D or have any part in shaping their policies, I am afraid my opinion doesn't count for much.
What do you want designed?