Polymarket's prediction market for the 2028 U.S. Presidential Election is experiencing unusual trading patterns, with 70% of the volume focused on candidates with less than 1% winning probability. Notably, NBA star LeBron James and celebrity Kim Kardashian have attracted $48.41 million and $33.84 million in trades, respectively, despite their near-impossible odds. In contrast, high-probability candidates like JD Vance and Gavin Newsom see significantly lower trading volumes. This phenomenon is driven by traders exploiting Polymarket's 4% annualized position rewards, which exceed current U.S. Treasury yields. By holding both YES and NO shares on the same candidate, traders can secure risk-free profits. Additionally, some users convert NO shares into YES shares for better liquidity and execution, further explaining the skewed trading volumes.