Some people here in community must exist who never bother to accept answer as answer. How should moderator deal with them? They always gets an answer and disappear. Now more response, never mark answer as answer, but ask next question instead. Moderator should consider these type of users. I think?
Nobody can mark a question as answered except the asker, not even moderators, and that is by design.
The checkmark means, from the perspective of the asker, "this answer solved my problem or helped me solve my problem." Nobody but the asker can make that judgement. Consequently we do not (and will not) attempt to moderate, scold, encourage, cajole, badger or coerce users into marking questions as answered. It's entirely up to them.
There's nothing bad or incorrect about never accepting an answer on a question.
Welcome to the Internet.
Internet is full of people
- that come and go
- that come and stay
- that are intelligent
- that are stupid
- that can read rules and guidelines
- that bother to read rules and guidelines and don't bother abiding by them
- that don't care about the rules and guidelines
- that enjoy using a service by the rules and guidelines
- that act like [boy|girl]-scouts
- that act like bullies
Stack Exchange is on the Internet, and, by default, there is all sorts of people using the site.
Stack Exchange suggests to mark the answer as accepted. There is a reward for the OP and for the answer author. You'll find people that will enjoy doing it, and you will find some who don't know or don't care.
And it's ok.
At the end of the day, it's only 15 reputation points.