It's easy to overestimate the importance of that metric, though. Some people can watch loads of content on a given channel and still never subscribe to it.
I understand that, I truly do. But my first thought upon seeing the teaser video was to
smash that like button and subscribe for more content (a phrase that I'm sure every single one of you recognizes). I subscribed immediately because I wanted to support the channel and help it out in a small way by adding to its subscriber numbers--and whether other folks who've posted in this thread don't have a habit of subscribing to channels they watch frequently or not, I kind of expected the same sentiment from many of them, that they'd show their support by subbing to the channel.
And believe me, I very rarely subscribe to any channels. I'm exactly the type of Youtuber who doesn't need that functionality to help me find stuff worth watching. But subscribing to bitcointalk's channel? That was a no-brainer for me.