The above comment about captcha got me thinking - when a post reaches 5000 comments, captcha becomes mandatory for every comment. At the moment that's the point where I close the prompt post and open a new one, but how would people feel about prompt posts being closed at 4000 or 4500 comments?

(and I should mention, we're going to have a week long prompt freeze once the current post closes. It'll start today if everyone wants it to close at 4000!)