I don't really see the point.
There are rules and stickies posted that, if read, should clear up just about any questions or confusion on how to behave. This is also a pretty active community with plenty of gorillas to gently (and occasionally a little less gently) nudge someone back onto the straight and narrow when they stray.
When somebody does get banned, it's not like it comes unexpectedly out of the blue. It seems to me this would be just like rubbernecking at a car crash. That's just my two cents.