it's incredible how easier is to lose everything on bitmex than doing some gain.
I've done 5 testnet trades and I lost everything in 4 out of 5.
and, very bad thing, when the last futures expired I wanted to place a long position, and right in that moment "system overloaded could not process order"...
I think it's impossible to place an order every time there is a clear market movement
You only stand to lose everything if you risk everything, and do so making high leverage trades.
You have to maintain liquidity by using their "Risk Limit" setting. If you are trading at 100:1 Leverage, the setting has to be set at 200, which is the lowest risk limit and allows for the highest leverage offered.
Leverage can be a powerful tool if you know what you are doing. I wouldn't recommend doing 100:1 trading, but 25:1 or 40:1 leveraged trades can work well as long as you are placing orders that won't wipe your balance to zero on a large swing. Also if you for instance go long on XBT (BTC/USD); and the price drops, you can always add to your position which will lower your Liquidation Price.
Painting the tape before jumping into a live position is also a way to minimize risk; painting either up or down depending on if you are long or short. After you've set your trading spread buy orders, you can enter in using either a limit order or market order.
But just taking your balance, buying in at a long or short position and praying that the price moves favorably is not how traders make money.
You also have to have a solid understanding of how the margin interest is calculated, and what the margin requirements are. You need to make sure you have a workable liquid balance to buy into a trade that goes sharply goes negative unexpectedly.
And last; learning how to guage market direction based of RSI, and other indicators; not just eyeballing the candlestick chart, can make BitMex's service and their high leverage offerings a valuable tool to use when the timing is right.
In terms of timing; today a 40 Million USD dump occured on Bitfinex. I just happened to be at my workstation and noticed the plunge. I was able to set up a number of high leverage trades in the 10-30 minutes after the initial sell of; and ended up with a 70% ROE from my positions, nearly doubling my bitcoin. Not bad for 30 minutes of work.
BitMex is among the best in terms of fees and volume is good.
Cheers!
Strato