We started regularly and actively trading on Bitmex since the beginning of 2019.
YTD 2019 we average about 7% / month net profits almost unleveraged, I recommend keeping the leverage between 5-7x unless you are really hungry for returns, so you might expect to increase your Bitmex balance by 30-60% every couple of months (with reasonable leverage),
although of course no one can guarantee future returns...
Try it out for yourselves, chances are good that you'll be pleasantly surprised by the accuracy of our daily trades, as well as acquainting yourself with some innovative trading strategies, which are also discussed in our weekly BTC trade wraps.