[smabie]

Well you have 504 trades approx, but you're buying in and selling out, so you're paying the cost of spread once per day (252 trading days in a year).

Let's say you have have a strategy that has 7% return and 3% volatility. That's a pretty fucking amazing strategy. So you lever up to 4x and now you have 28% return and 12% vol. With your spread tax, you now have 18% return and 12% vol. Using their 2x leverage, you'll have a 14% and a 6% vol. So while your Sharpe ratio will be lower, your max return will be higher. And since you can't eat risk-adjusted returns, the tradeoff could very well be worth it.