My problem with demo videos is that they're about whatever you say they are. If you were cynical enough, you could take one set up and record about 6 or 7 different videos.
Without changing a single setting, in one video you ostensibly demonstrate the pickups, in another video you're talking about the strings, in another video you're talking about the body wood to make some point about 'tonewoods', in another video you talk about how the maple board gives a "brightness" that the rosewood equivalent lacks and so on and so interminably on making video after video with the exact same gear.
If you play well, your "pickup" video will garner compliments about the quality of the pickups. Your "strings" video will start some discussion about nickel vs steel.
Having said that, I watch pretty much every one I find. I just really like looking at basses