@ silverston
In the beginning you have no bitcoins and, let's say, $2000.- availlable. Then you buy BTC2.3 against a prize of $783.10 = a total of $1801.13. Left over $198.87. After a while you sel your BTC2.3 for the current prize of $787.10. You receive 2.3 times $787.10 = $1810.33.

So at the end of the first trade cycle you have null bitcoins and $1810.33 + $198.87 = $2009.20
In the second trade cycle you start with buying BTC2.3 aganst a prize of $794.99 and so on....

I must admit that you must start with enough dollars in stock. But you don't loose money or bitcoin!