TL;DR
Pricing & fees: Sportsbooks bake in vig (often around -110 on 50/50 lines), implying ~4–5% house edge on balanced action. Prediction markets quote probabilities as prices (e.g., $0.63 = 63%) and tend to charge lower/transparent fees (e.g., Kalshi posts a public fee schedule; PredictIt charges 10% of profits plus policies on withdrawals; Polymarket currently states no trading fees though on-chain/network…
