Because when the one who questioned gets a reply and it turned out to be just a following mark, they often get mad 90% of the time because they thought someone found or recommended the manga but only turned out to be just that.
Because we have good courtesy. (≧∀≦) As the questioner may expect for the answer after getting notified but it turns out to be just someone also want to know the answer.
Aah, that makes sense. Thank you for illuminating this mystery.(づ￣ ³￣)づ
You're welcome. (●'◡'●)ﾉ
Why do you always apologize for following?