Scalping
Every dollar in commission is 400× leveraged by trade frequency.
At 400 trades/month, reducing commission from $7 to $5 per round-turn saves $800/month. Most brokers offer volume-based tier discounts — ask for them. If you trade 0.5+ lots per trade, you have leverage.
London/NY overlap (8 AM–12 PM ET) offers spreads 0.1–0.3 pips tighter than Asian session. For 400 monthly trades at 0.1 lots, that is $40–$120 saved on spread alone — plus faster fills reduce slippage.
A market order during a volatile second can slip 1–2 pips. At 400 trades, even 10% slippage rate at 1 pip costs $40/month. Limit orders eliminate this entirely and give you the exact entry you calculated.
