I've watched Jamie 2 days ago for the first time. He wasn't winning and was dealing with it really bad with all sorts of tilt. And I watched for hours
What you need to understand is being a streamer is as much of a performance as being good at poker, and he has a lot of respect from me in terms of how he runs his stream, and we definitely need more people like him in the community catering for twitch/YouTube crowd.
That one time I tuned in basically told me he will never be a top MTTer (simply because of mindset) but it sure as hell was entertaining and you can't deny he's the highest tier poker streamer. All he needs to be is keep being an okay player and it's great to have him