As we’ve learned from this post, there are lots of questions and answers out there that could use some editing. Unfortunately, if you have over $2\text,000$ rep and the Copy Editor badge (for $500$ edits), there’s absolutely nothing to be gained from this.
I don’t know if this is to be proposed here (or in a more general site Meta), nor if this could even be realistically changed, but I believe that the Copy Editor badge should be able to be awarded multiple times, once for each $500$ edits. This would give users an incentive to fix posts that wouldn’t fade away after a threshold. Moreover, it would reward those users that have improved the site beyond their duty. Since less than $250$ users have the badge anyways, this change would be slight, but I believe it could have big effects.