> 99.6% of them didn't take the insane bet.
I don't think the actual bet was insane, but the concept of betting on the weather is insane.
People bet on anything and everything, and the less controllable the better, afaict. "I'll bet you $5 that snail will eat the cucumber before the broccoli" - > "fuck yes, make it $20" is 100% a thing I could see happening. Weather is significantly easier to do every day though, unless you know a snail farmer with a twitch stream (if so, hook me up!).
There are legitimate reasons to bet on the weather. If you're a farmer, betting on drought can be a hedge against a bad year.