I've been watching blockchain.info the past few weeks, and the estimated ROI has dropped from -30% to -50% in the course of about 2 weeks. A few months ago it w

I've been watching blockchain.info the past few weeks, and the estimated ROI has dropped from -30% to -50% in the course of about 2 weeks. A few months ago it was positive. I'm assuming blockchain's estimates are based on standard hardware.