Agree with B. Rich - nice, original concept and a funny backstory! The commentator works well, too. This seems like a concept that could be developed further. There some unresponsiveness, or at least that's what it felt like, when I sometimes couldn't click on the dragons. If the buttons are disabled, they should maybe turn to a different color so it's more clear. Sounds of the dragons running and roaring, and crowds cheering and booing, would be nice. I assumed there was no ending to this game, so I just bet all of my money until I lost in the fourth race. I spotted ZYXXY twice, but not 42.
I made a game for the jam, too, "itCompany". Feel free to leave feedback if you like!