Character Inference from Jim Smiley

In Mark Twain's short story The Celebrated Jumping Frog of Calaveras County, a man is approached by a stranger in a tavern who asks him to tell a story about his friend Jim Smiley. The narrator learns of Jim Smiley's peculiar habit of betting on everything, from horse races to the health of a frog. Jim Smiley had a frog known as Dan'l Webster, whom he had trained to jump exceptionally well. One day, a stranger comes to town, and Smiley bets that Dan'l Webster can out-jump any other frog. However, the stranger tricks Smiley by filling his frog with quail shot, rendering it unable to jump.

What can be inferred about Jim Smiley’s character from this story?