And the reputation gained should count towards their ability to close the questions themselves single-handedly. Otherwise this site will continue to be the endless stream of extremely low quality content.
I can spot a few people who care for the quality. Alas, they gain almost no reputation points. At the same time, people who care for the reputation points only writing hasty answers to off-topic or duplicated questions always get rewarded. This is an economical matter. Given the reputation points is a "currency", the population will always opt for the action that will give them a reward. It means Stack Overflow is intentionally driven towards being an endless stream of low quality content. It should be changed towards quality, not quantity.
The irony is, finding a duplicate often takes incomparableincomparably more effort than writing an answer. I myself is often tempted, "What the heck, what I am wasting my precious life for? Why not to write that primitive answer to a primitive question and move on?". There is not even a ready-made link to Google search to ease the task, so you have to type site:stackoverflow.com manually and then paste the question title in the address bar. While it can be easily done with a single click, if only Stack Overflow did care for people who care for Stack Overflow.