Another thing to not, don't bank on subs alone!
I.E:
Channel 1: 5 Videos x 20 mins long. x 5 subs
Channel 2: 5 Videos x 1 min long. x 10 subs
So, although he has more subs, his videos aren't as long and doesn't get video retention! even if all 10 people watched the whole one minute video...