You pay them. You also tell them that their job is to identify good answers, not to give detailed feedback to bad answers.
not to give detailed feedback to bad answers
If your goal is to foster understanding instead of giving canned answers, this seems counterproductive.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.