@tripppn, In your example both R2 and R3 have overpriced shares. Can you make another example, where shares won't be overpriced (and hardware will be sold at market GH/$ rate)?
That's the problem with the way you're thinking about this...
You wouldn't be buying a set number of GH/$
You'd be buying into a mining organization that pays out regular dividends to shareholders, with the goal of dividends + the price you eventually sell the share for being greater than your initial investment. This isn't a short-term 2-3 month deal where you hope to make a bunch of cash and it's over, it's ongoing.