I used to think: Could you compete with Jane Street in quantitative trading? Could you outperform Jump? In the A-share market, could you outmatch Liang Wenfeng? Later, I realized there are countless niche markets that remain untapped—not because they’re unprofitable, but because their scale is too small for big players to bother with. Yet these markets are perfectly viable for most of us. Maybe Jane Street requires an arbitrage opportunity to generate millions—or even tens of millions—in annual profit. But for us, $500K a year is already extremely attractive. Shallow waters don’t attract big fish. The ancients already told us this.