Crumb Boss is one of my favorites, there many tutorials out there not just You Tube, and people are entitled to their opinions of who they like or don't like. Some are professional cake decorators, some are novices. I think they all are entertaining to watch and learn from.
I went to college for it, I also work in the industry and I have learned quite a bit from tutorials. Some of the best cake decorators were never formally trained and are strictly self taught. I will say it again, it does not matter how you get there, just so you get there.
People gripe and say you can watch tutorial after tutorial it's not going to take the place of hands on cake decorating and and years of practice. Well, maybe not but it's a start and we all started some where.
So if somebody tells you that you won't learn anything watching tutorials, tell em to kick rocks!!!