So it's gone down again apparently ...

I have a question - how is it that the returns are so consistent? With manual arbitrage trading I would expect greater variation in the rate of return. No one knows for sure what direction the market is going to head at any given moment (if they did, they would be a multi-billionaire) so there is always an element of luck involved. How is it possible that bitcoin-trader traders consistently achieve daily returns of between 0.5 - 1% ?

It would make more sense (and seem more legit) if, say occasionally we say 2%, then occasionally a negative return. Particularly during periods of high volatility.