Hi, I've been grindind 3.50$ and 7$ turbo STT's for a while now and I'm wondering what the attainable ROI in 2016 would be in these? Any information I could find so far was posted somewhere between 2009-2013 and I assume the ROI has gone done heavily since then.

I've heard people say that even 5% ROI is extremely high for 7$ turbo STT's these days, is that true?

Hope someone can help!