I would like to know why my comments are deleted:
I have commented the Chad answer...
I didn't get notify or something. I cannot see my old comment anywhere. Nothing. Just gone.
The comment thread was getting too long and it was beginning to go off topic.
The Stack Exchange format is for Questions and Answers to those questions, and the purpose of comments is to supplement that. Long discussions in the comments that aren't specifically about the question or answer will be deleted.
Comments begin to become noise, that casual visitors probably aren't here for, and we strive to minimize the noise here.
Don't feel like you were singled out there. there are at least 10 deleted comments on that answer.