My costly lesson in Polymarket - Trusting the 'sure thing'

Been meaning to share this for a while, a lesson from late last year that really hammered home the need for proper risk management, even on something that seems low-risk like Polymarket. There was a market up regarding a relatively niche political event, something I thought I had a really strong handle on given my background. The odds were heavily skewed one way, and I felt I saw an angle that others were missing.

Instead of treating it like any other bet and sizing appropriately, I went in with a much larger portion of my available capital, convinced it was a "sure thing" that the market hadn't priced in correctly. My conviction was through the roof. Well, surprise, surprise, the outcome was the exact opposite of what I predicted. It wasn't even close. The market resolved against me, and I took a significant hit. The main takeaway for me wasn't just being wrong on the prediction itself, but the arrogance of thinking any market, even one on Polymarket, is a sure bet and deserves outsized capital allocation. Humility is cheap, tuition is expensive. Sizing for potential loss, not just perceived gain, is now burned into my approach.