Love the Tube. Watch it for fun, for knowledge, to figure all the functions on the new laser measurer and which spark plugs are the best. But for audio gear it's only useful if it's essentially the video version of a really good written review. In terms of demonstrating the sound it's nearly useless.
Consider, someone is demonstrating their system. The play some piece of music and record the experience for a YouTube video. First issue isn't even their mic, it's the placement of their mic. Then there is the mic itself. Professional? Maybe. We'll assume yes. Audio/video capture on their pc might be MP4 at best. Then it gets delivered into someones PC, which decodes the audio, pushes it out through maybe a high-end audio card but most likely the on-board audio circuitry. Then out through a port, over crappy computer wire (uh-oh, troll alert!) then to our computer speakers. No Way that is going to allow one to even VAGUELY hear what the original system sounds like. Not a chance. And if your pc is hooked up to your audio system there is still the mic problem and the format. Just not a chance