Stupid question... why is clear stock so desirable?
What's the big deal if it's cloudy?
Why does it matter?
Yes, I did Google around for this. Although I found a lot of talk about techniques to keep stock clear, and purification/filtering methods, I could find no information about _why_ this is important.
This seems to be one of those things that people in the know just know. Maybe that's just the way that things are, and the way we've always done things.