If they know that their performance are being tracked they will problably think harder before making a punt. Or at least qualify their punts. Same goes for the snake oil salesman out there. Or is there an underlying truth we must accept that they also dont really have a clue where this market is going.
Magnus Heystek once spoke about a SABC commentator (he didn't give us the name) who was forever predicting some disaster in property or shares or currency or whatever.. He said "You've got to admire this guy's consistency - he's been consistently wrong for 40 years"