I'm always amused at how little cross-promotion Marshall does - he has decently large followings in two completely different contexts and most of them are completely unaware of each other.
Especially since this YouTube channel might be bringing him more money than anything else now. I only knew about this since LSV brought it up during an LR episode on Marshall's background
What I only realized today is that his watch restoration channel has more subscribers than the official Magic: The Gathering YouTube channel now. That's insane.