I considered only the hardware stated below and assumed a linear 20TH/month increase in difficulty, already starting "aggressively" (debatable ) at ~178TH/s in june (bear in mind that at today's difficulty, 390GH/s would yield BTC491/month).
Div/share/month is based on the 40,000,000 split, with the accumulated BTC in the "Growth/Expansion Fund" also shown (minimum of 20M shares).
ROI shown for BTC5E-4 and BTC10E-4 share price, current share price is at ~BTC9E-4.
I'm expecting the numbers to get even better with announcements of even more hardware buys. Lets keep the "Growth/Expansion Fund" always depleted!
Increasing network power by 20 TH/s per month... Really accurate... Why can't people just use normal extrapolations like 15%-20%...