I believe Amy can be given credit for the inventing the online knitting video. KH was launched in Nov 2004 (even earlier if you consider KH original was part of Amy's personal website), and youtube didn't come around until Feb 2005. It wasn't until just a few years ago that the masses started producing knitting videos using the same knitter's eye view which is familiar to Amy's videos.
I agree that the pool of talent producing videos vary widely. Amy has always strived for accuracy and thoroughness in her videos. I remember her researching various techniques, calling LYS to see if they had heard of such and such method, etc.
A significant number of our videos were recorded in the early 2000's with low resolution digital camera capable of filming 30 seconds at a time. We are now working on re-filming many of these older versions with our HD camera.