Trading contracts is quite strange. With a hundred times leverage, if you want to earn 10%, you must make a profit of 20%. The 10% for opening and closing positions is a fixed cost (market order single-side fee rate of 0.15%).
Many people will max out their leverage. Although leverage amplifies the principal, it also amplifies the risks and costs.
If there is a rebate, at least it can effectively reduce the transaction fees.
You may not notice the fees for one or two transactions, but trading is long-term, and this cost accumulates to an astonishing amount.
