A skilled bettor of horses has intimate knowledge of tracks and their conditions, horses and their health issues, jockeys and their riding styles and many other factors that they use to better increase their odds of winning. With such information available, professional bettors will wager on more horses and play more odds when the conditions are right. They still will lay straight bets, because straight bets are the easiest to hit. But when having thorough knowledge of horses, jockeys, tracks and other factors, it becomes much easier to wager on multiple horses and make more exotic wagers that can pay off with very good odds.