I'm unsure that I "get" this, why ever sell if you're going to buy at the same time?
If this relies on the price always going up, shouldn't you just buy 0.4 at 800 and hold forever?
If this relies on the price always going up, shouldn't you just buy 0.4 at 800 and hold forever?
Yes, you are right, in real trading there is no need to sell and buy at the same time, that was for example purpose. The main idea in here is that you need to take your profits at the levels which you specify in the strategy(stick to your rules), imagine them as parallel orders, for example you made that sell in order to get your profit, now if the price comes back from that point of 860 to 800 again you buy one more time since on that level of 800 you do not have any open order. The main profit in here is done when prices fluctuates up and down which exactly happens these days.
I am still testing the best grid size and position size on each level, so far the best are at arround $20 grid size with profit on the 3rd level. Another approach is not to buy 0.1 btc at each level, but instead buy worth of $50 of bitcoins, this way on the 3rd level for profit you can close a small portion of your btc just for the profit, avoiding payint too many fees.