You have to say something funny or something other people can relate to and then involve your channel in you comment, without beeing spammy.. Yeah, it's a bit tricky, you have to get used to it first^^
Your advice has helped meI taught you well. :')
I have like 5 more subscribers (~50%) just because of the commenting
But I made it a little different, I commented on videos with less views to let the person who made the video subscribe 
Il try it ..but i dont see it working all that well -- cause every channel is stuck on top comments rather than newst comments -- so itll have to take some scrolling to find a RANDOM comment like mine -- yeno?
I could be wrong here, but I thought "Top Comments" was sorted differently for every user, depending on what activity and Google+ circle members the user has had. In other words, the Top Comments I see might be different than the Top Comments you see. I thought YouTube made this change a while ago to make the comments more relevant for each specific user.

Personally, I do. But I never proven it so I'm not sure. I know someone else who doesn't hit share and still gets lots of subs from this method.I've got a question, when you comment on someone's video should you tick that "share on Google plus" box that you're prompted with before commenting