I understand it just fine, you don't seem to understand basic math.  Show your work or you're just making crap up.  

There's plenty of projections that show a positive ROI even at 100x difficulty and beyond.  I have yet to see a single credible projection that doesn't show a positive ROI at some point within 2 - 3 years with all the worst case scenarios coming into play at the same time .

I trust Organofcorti's calculations far more than I trust your speculation.