I'm not sure, but does Gekko simulation take transaction fees into account? That might be the reason for your discrepancy. I also find it surprising you trade succesfully at cex. I thought that market only had one direction... down...
No tx fees @ cex. It's an overall downslope trend there fersure as GHS gets cheaper outside of cex, but there are enough ups in their graph to make it worthwhile for gekko. Any motion, up or down, is technically a gain with a bot watching things. Plus the mining.
http://bitcoinwisdom.com/markets/cexio/ghsbtc
mmm, ups and downs.
Edit: in fact gekko is doing well on cex to the point where it's now visible in my cex hashing speed graph.
(each blip is an hour's average, so the low peaks don't mean losses, just mucho activity. The high peaks are the important bit.)
