There are two differences here.
For audio, you need better damping because the operation is continuous. Speaker stands, for example, need to damp vibration while speakers are vibrating. For photography, typically for those that require tripods, the actual capture takes up only a very small fraction of time. You can almost always afford to wait for vibration from mirror slap to die away before you open the shutter.
In audio, there's also a lot of high priced scams. This one is my all time favorite:
http://www.boingboing.net/2005/11/07/astronomically-overp.html
yes, that's what I like about the audio world. All the snake oil stories. Can learn a lot from their marketing literature. How to market a stone and sell it like a diamond. Where once there was no demand, now there is a lust for it.
Having said that, lots of people buy into the snake oil to keep these companies afloat.