I understand. Anyone should be allowed to start a new thread. and keep it open. But for personal matters, it is common in all boards they will close a thread because the OP asked them to. They will ask them to close it because they regret starting it in the first place or they found their answer and didn't want it to turn into a heated debate.. they didn't start it to start a debate but to find an answer for herself)
Sometimes if I start a thread to make a fun game, I will make rules for that thread to the very beginning. If people didn't listen to that rules and did whatever they wanted to do, it wouldn't be fun and I lost my purpose of starting that thread in the first place. So in a way, if it not working out, I probably will ask the members to go by the rules or just close the thread. BUT I would also lost my purpose of that thread if I kept adding new rules as I go along (unless it is a good reason) and it isn't really fair for the other posters. And that would be another reason to close my thread.