Let's start with the title.
Simple arithmetic question
The purpose of the title is to make a question recognizable. If someone else comes to the website with the exact same question, would they recognize that this is the question they are about to ask? No, because this title says absolutely nothing about the topic of the question. It could be about the BIP ...
There are people who have not downvoted but explained what they see wrong with the question.
Yes, commenting is optional when you cast your (down-)vote; you can't force people to explain themselves.
Yes, this is normal for Stack Exchange not to duplicate comments. Perhaps, other close-/down-voters simply agree to existing comment thread.
I too think that you ...