Binance Exchange charges a commission for each trade at a rate of 0.1%. If you have Binance Coin (BNB) and you enable the mode in your personal exchange account that you want to use them, then the exchange provides a discount of 25%.
For now the algorithm can not automatically buy BNB to reduce trading commission. We plan to add this feature in the near future.
Therefore, we recommend you to control your BNB balance and manually purchase it to increase the profitability of the algorithm. (but not for the funds alloted to the algorithm!)