I have one thing to comment now no one said before.
If I want to claim my brought BTC in margin trading.  I mean keep the BTC not by sell it our to calculate profit or lose.  It will cost me 1% fee to do that. Why? I claim the BTC means I paid swap and interest. Why additional 1% will be cost?   To avoid it, I need to make a margin sell order and then make a exchange buy order instead, That means 0.3%.   Anyway, I think the 1% is not reasonable. What is it for