tip is a misunderstood word in horse racing. all the trainer had was his confident on his/her horse to win. By giving the info to the owners, the owners can try to win more $$ via betting instead of counting the winning horse purse.
when a horse is good, the horse can bring any lousy jockey to the winning post. if the horse CMI, even the best jockey in the world would not increase the horse winning chance.
as for horse racing being dirty, it no more dirty than other sports ie..F1 teams force the second driver to give way to first driver, football teams play to a draw to knock out the third team, badminton player purposely lose in other to avoid a better team in the next round etc etc... horse racing look bad because it a sport that equal wagering since the dawn of history but in nowsaday, bookmakers allow betting in all sort of sports so it not fair that only horse racing is being single out.