As I'm new to Chess.SE, I was curious as to the community opinion on asking a question and then accepting your own answer when others exist. I understand that it's encouraged by SE to answer your own questions, but what about accepting the best answer? If others people answer your question and get a number of votes, it seems a bit odd to me to answer your own question a few days later and then accept that one.
A user has been going around asking questions, waiting for other people to answer it, posting his own reply in the answers section and then accepting that reply as the best answer. Is this type of behavior common in SE sites?