jake weber
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I respond to all comments usually even if its something simple like "cool" For those simple comments i usually just say thanks for the support and checking out my video. Works every time 

I tend to respond to most of them but not where others are having a discussion unless I have some sort of input for it. I sometimes feel like I shouldnt respond if all I am doing is thanking someone but I do think people appreciate it, I think it can look a bit funny if you respond to loads of them with thanks etc (I still do this as much as I feel like this at times).
I try and respond to all of them that's on topic. But the bigger you get (I'm not big of course) the harder it becomes.
Yeah, I was thinking maybe some of them might say to themselves "I'll respond to the first 10 or 15 on every new video" or something. Of course some just chuck responding altogether and I bet it's to be fair to all the people who comment.I have experienced something similar here at YTtalk, I used to go through every introduction thread every couple of days to welcome all new members, now I find it exceptionally hard to do so that were growing so rapidly so now I only respond to a few here and there, I kinda feel like I am leaving others out but it has gotten to a point where its nearly impossible for me to do so, so I understand now why YouTubers are like that with their comments section when they get so big, they might feel that if they reply to one, why not to all etc
Yeah, I was thinking maybe some of them might say to themselves "I'll respond to the first 10 or 15 on every new video" or something. Of course some just chuck responding altogether and I bet it's to be fair to all the people who comment.