One reason for not seeing the exaggerated stance more is that good riders can get away with NOT doing it because they make up for it on EASY TO THEM sections by subtle body movement, and feel of controls that novices dont have. (any many will never have)
However, when you see them in a DIFFICULT FOR THEM section - you will find you see alot more exaggerated position. However - it may happen very quickly. Ask them to ride an easy off camber section one handed - and you'll see the exaggerated position as well.
My personal approach is to practice the exaggerated methods and then forget everything in competition,
I find figure 8's on a steep, loose off camber keeps me honest.
Most of the really good riders will mirror what Sting said - practice the basics and work the foundation 1st.