On Stack Overflow, we have a lot of invalid questions that have a lot of upvotes, answers and selected answer. I understand that this is so because these questions are the easiest to answer, and so:
- Incentives posting a question without search justified
- Incentives answering a duplicated question instead of flagging it as duplicated.
I propose the following modification, to stop with this incentives: From now on, closing a question removes all reputation that the question generated.
I had this idea myself, but it is duplicated from the first answer in this question. Since it is an answer and not an question, I'm adding it here as a question just for sake of completeness.