I dont know if its "loyalty" but I always put something on certain sires in a race, especially maidens. For instance, Capote or Sillver Deputy fillies. If there's a Capote or Silver Deputy filly in a race 8 furlongs or shorter and the filly has shown ANY type of class, I will put 2 bucks on her. Just learned that those two stallions often have great prices on the board with daughters who seems to win at a great clip in maiden races. So, maybe a "learned loyalty".