>>Also for TAN, how many people in our group are really trading TAN?<<

Probably not many. I've never traded TAN myself. But I would start doing so if there'd be a profitable robot for it. I'm also not saying it should be TAN, but my preference if there is to be a new robot is for something that has a low correlation to the existing ETF's. I think it will be difficult to find an ETF that is currently traded by many members and has low correlation to IWM/GDX.

After all, diversification of low correlated but individually profitable systems is the only free lunch there is on wallstreet.