I totally agree that audio has to be good and understandable. Also you need to consider that better quality video, to most of us is HD, means that the video file can be too large for Internet marketing purposes. When doing Internet marketing campaigns you need to make sure your audience will be able to see the content of your video. Waiting for the video to load is not an option here, so you need to compress the video in a way that almost every Internet speed can manage (H.264 is your friend here).
"We were thinking we had a market for a series of "how to shoot good
video for video marketing purposes" but now are wondering if it's worth
the effort."
You do have a market there and a HUGE one I must say. I'm a Internet marketer myself (well video Internet marketer is more accurate) and I can tell you there are many people looking for exactly that. Many newbie video Internet marketers struggle doing video and they don't understand this world. They use the point and shoot approach (which is not bad if you know how to do it), they don't practice good audio and stay with one camera angle all the time (which again is not bad if you know how to do it). Like everyone here mentions it depends on the audience, but I believe that most people don't want to see a top of the line video production, they want to see who is the person speaking, what are his/her struggles, passions, goals and on the other end, does the video satisfies the necessities of the viewer?. Most of the time the general audience wants to see how someone triumph over all their problems and they want to know about the "secret" way they overcome their problems. Using video is the single most powerful way to get this message and again a top of the line video production is not a necessity. For example, a person can design their own set in a quiet room of their homes with things they like or already have available and record everything there. If they don't understand how to add complex graphics in post, they can simply use a drawing board or show some pictures printed on cards. They can use any camera, any editing software, in the end is how good they can get their message across.
In my case if I want to do a video I can make martians attack the Earth, make complex animations, make a war movie just to announces a product. I can do that because I know how to do it and have the editing and motion graphic experience to do so, but the importance is the quality of the message and how well I can satisfied the necessities of my audience. Also I will not do this kind of "explosive video" unless I have a community that already knows about my struggles, passions and goals. When they see this videos they will know is me expressing my passion of doing complex video productions.
The meaning of a movie are the characters, the life of the movie is the music, but the magic is in the editing.
Luis O. Maymí
Follow me on Twitter @lomaymi