I found this weird too. It's like they want to give out free money to people. Many books even offered around 1.05-1.1 odds on Biden even after AP called the race in favor of Biden which took me by surprise. Easy money.
They want to take money from people. You had to buy the tokens, then trade them, and of course there is a fee. The house isn't risking anything and isn't giving anything, only raking in money.