John Ward is the most technical and I wouldn't be surprised if he is not on the autistic spectrum - Aspergers?, he clearly knows his stuff and has a passion for it.
Thomas Nagy for some of the nifty video editing, Very clever marketing via youtube for the trendy London market he operates in, it wouldn't work out in the shires but London he has it spot on as he is now taking on another employee. So business is doing well. not sure about the actual content but its works for him.
GSH good for trainees and college kids.
BigClive is good for all round entertainment and humour.
Personally I haven't got the time to be playing around with a camera and uploading stuff to Youtube each week, doubt half of my customers even use it. Some dont even have a smart phone!