Another thing I have considered is to do more volg style content and give a bit of insight into me and what makes me tick and why I am on YouTube as a marketer etc. But we'll see.
That's a great idea, but you need to be really careful in the execution in my opinion.
I stopped watching Roberto Blake because he became (again...in my opinion) unbearably self-indulgent with constant references to himself as a successful entrepreneur. I just wanted to hear his advice on digital marketing...not him constantly blowing his own trumpet.
Authenticity is so important on YouTube, and for me at least it's far more interesting to hear about somebody's struggles in business, the learning curve they have gone through, and to some extent their personal circumstances.
Tim Schmoyer does this really well. I listen to him for his advice and insight, but I know that he has 8 kids and that his new born had to have an operation on her eye. I know that he was a youth pastor and is quite religious (although he does not push this at all), I also know something about how he grew his business and where he plans to take it.
For a viewer I think it would be interesting to know more about you - simple stuff like whether you are married, single, in a relationship, gay or straight, whether you are renting a flat and hoping to buy, already own a home and want something bigger, buying a new car...
To do this you really need to open up your life to the public, but I do believe it will grow your subscriber base and views as a result.