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The way I look at these numbers, what this should equate to is that dividends would then end up reflecting about 60% efficiency of a situation where a person bought and managed his/her own hardware.
That is, bonds are bought with funds of quantity X.
20% * X = initial expenses.
80% * X = initial hardware purchases.
75% x initial hardware = bond holders dividends.
80% x 75% = 60%
Therefore, 60% of ALL coins mined by Lab-Rat-Mining are straight dividends.
Using BFL minirigs as a baseline: One BFL SC minirig is 500GH for $23,000 (or 500,000MH for $23,000).
That equates to 21.7MH/$.
60% of this hash power/cost efficiency would be:
60% * 21.7 MH/$ = ~13.0MH/$
Initial lowest priced purchases of bonds are approximate as 100MH/$15 or ~6.7MH/$
If hardware was in hand, the numbers given of 100MH/bond then are very conservative. Straight numbers indicate bonds should perform at 200MH/bond (where the bonds are initially bought at least price of BTC.15). BitFury prices would be even better.
This of course does not take into account what the difficulty will be when hardware is actually placed online. This is why it is important to secure good deals and delivery times. It seems to me that Lab Rat's priority should be to do everything he can to acquire hardware cheaper and faster. And dividend numbers is what will really drive the purchase of future bonds.
I'd like to add that since every second counts in this mining race, I doubt there's any possibility of me being able to secure new hardware faster than someone like Lab Rat, who can now make giant orders, and probably get a jump on the order date, plus get discounts for buying a large volume.
So, he can most likely get it faster and cheaper, which are both very important factors that should be included in the calculations (but we'll have to wait and see for some data).