I could watch one if it were well done. I've never found one that is.
YammieNoob did a decent job of editing, cutting out a lot of the 'ummm' and silence and rambling, keeping mostly the content. This is a good idea, makes the video tighter.
However, almost no one that does this is particularly thoughtful or well reasoned. Like, if I want to hear an expert talk, I'll listen to a podcast. A guy on a motorcycle is probably not at the top of his game in terms of producing content. He's paying attention to the road even if he's smart, so he's not going to be super witty or sharp.
And if the guy doing the vlogging is dumb as a brick, or is a squid, I don't want to see what he does or care what he has to say.
On top of that, the videos aren't particularly exciting or engaging. Like, woo, car taillights.
Now, if someone rode a lot, recorded their riding, and did voiceover to illustrate techniques being used, hazards to avoid, something that happened on a ride and how to anticipate next time, etc, that could be interesting.
Never ride faster than you can stop