It will happen to you, too. The 720 number is believable because I have a regular commenter who I start 50+ comment threads with. We roleplay the characters sometimes.
My novel just passed the sad midpoint in the series but none of my regular commenters missed a BEAT. The comment section was all jokes about decapitating ex boyfriends.
If I am a queen of anything it is convincing people to comment MORE. Now I have a legion of banter-artists who torment me weekly. The dream.