The other side is that they will cause a good table to go bad and it isnt worth making them think they are doing good.
I prefer to just not say anything in those cases.
Well when you refer to a "good" table, do you mean one with a lot of limpers and calling stations? That's a good table to me... Going "bad" would be everyone tightening up... IMO
Lack of Discipline and Over-Confidence... The root of all poker evil.