I'm a tremendous fan and frequent user of various StackExchange sites, and I've been looking for places to use a tool like OSQA or Coordino. I wonder, though,

I'm a tremendous fan and frequent user of various StackExchange sites, and I've been looking for places to use a tool like OSQA or Coordino. I wonder, though, about the scale required. My sense is that for sites like StackOverflow and Hacker News: Quality = Quantity + (Filtering, Sorting, Ranking) The software provides the second term, but I wonder how many responses or frequent posters/commenters one needs to have sufficient quantity. Any data on this?