That minimal percentage is worth a lot for those high capital trader that relying on short trade. They are already happy on minimal percentage gain since their capital is too huge. For normal trader like us, surely this fee is negligible but for high volume trader this is already huge as part of their profit. They frequently trade in daily basis which makes fee painful for them especially if their target profit
Even for a retail trader like you, the fee is not negligible. Just that you don't pay attention to it. Let me simulate for you a scenario where you will see how much fees Binance will get from your profits after 150 trades, assuming you are a day trader trying to grow the account.
Conditions.
1. Starting Balance – 1000 USD
2. Take profit: 5%
3. Stop loss: 5%
4. Number of trades: 150
5. Limit order fees: 0.1%
6. Market order fees 0.1%
7. Entry Trade Order Type – Market.
8. Take Profit Order Type – Limit.
9. Stop Loss Order Type – Market.
10. Win rate percentage ~66% (For every 3 trades, you win at least 2 on average)
Results
Now, does $790 still look negligible to you?