Update: This is not about encouraging (or bullying) people into accepting answers. This is about using accepted answer rate and voting patterns to detect when a user doesn't get the system and provide a tutorial.
For people who have asked 5 (or more) eligible questions and are eligible to vote, if they have voted less than 10 times or have an accept rate below 50%, the ask a question dialog should be replaced with a mini-tutorial on how SO works. The tutorial should be no more than a (short) paragraph. The user must click another button (Continue?) to get to the real ask a question dialog. This would not apply to meta, as the type of questions here are such that accepting an answer isn't particularly useful. The tutorial might only appear once or twice so that for people who really don't want to accept answers or vote it doesn't become too much of a barrier.
The suggested heuristic is flexible. The idea being that we want to encourage participation. I truly believe that in the majority of cases, people simply don't know how the system works. Usually after I leave a comment indicating such, the behavior changes. Showing a brief tutorial with a link to the FAQ helps a new user get acclimated. Showing the tutorial rather than denying the ability to ask questions gives the user a chance to respond correctly without doing more than adding a minor annoyance.
I can imagine further uses for the data and other heuristics that could be used based on whether the behavior changes, but for now I'd simply like the system to give the tutorial rather than depending on other users to help the new users along in this respect by commenting.
Sample tutorial text:
We detected that you've been using the system without rewarding people who answer your questions. [Site name] works when people who ask questions vote up helpful answers and accept the best answer to their question. Vote for questions/answers by clicking the up/down arrows -- down voting requires 100 reputation -- next to the question/answer. Accept an answer to your question by clicking the check mark under the answer's vote total. For more information read the [link to FAQ].