This is by far the biggest issue with DC! I have noticed several contests where the CH doesn't provide ANY feedback to the designers nor do they give ratings to any of the designs. Then all of a sudden, the contest is over and a winner is chosen. How are you suppose to know if you're providing the client what they're looking for, or improve your designs? This is so frustrating! CH should be required to rate or eliminate ALL designs.
This is NOT an issue with DC, it is a common issue will ALL crowd sourcing sites. I have said MANY times that we can't force the contestholder to rate or give feedback. It is "STRONGLY" encouraged though