Yeah definitely. I edited this after first post because I didn't want to be misunderstood. Those serial commenters are basically spamming and that won't bring any positives at all. People will tell if you're insincere.' Quality followers' is spot on - spammers won't get them. My point really is commenting is under utilized considering it's usefulness. Like now, I'm going to look at your profile and that wouldn't have happened if you hadn't commented...
Thanks