People wanting to add another suggestion are ideally suited for helping to identify existing suggestions that are better than other existing suggestions. Give site visitors a list of five or ten, with instructions: "Order these from best to worse to help us sort them out if you would like to add one yourself."
Now you have 10 - 45 comparisons to help weight the items in the list. Suggestions that are consistently ordered low can be removed, and those consistently ordered high can be given more consideration and time in the limelight.
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