1) he only issued 10K of the bonds at 1 BTC. I am sure the other 30K were issued near market price.
2) the exchange rate has been demonstrabley higher than $5 on average since GIGA floated the bond in April.
3) he has only paid out a total of 4,057 BTC in coupons thusfar (I have no clue where you came up with 15K), some of which is covered by his current farm
Here is a more realistic look at the situation:
1) Giga floats a total of 40,000 bonds at an average price of 1.1 BTC
2) Giga converts 21,818 BTC @ an average of $5.5 to purchase the 8 mini rigs
3) Cancels 4 of them and gets a refund of 60K
So this is where we are at the moment.....put yourself if Giga's shoes. What would you do?
You now have 18,125 BTC left from the bond issuance (44,000 - 21,818 - 5,057), as well as the $60,000 in cash from the refund. With the coming ASICs, you KNOW difficulty is going to massively increase, hugely depressing the coupon payments.
Assuming NO increase in difficulty (which is silly), you only has to pay out around 450 BTC a week (remember you have over 100 GH/s producing). That means you can pay coupons for 40 weeks before exhausting your BTC taken in on the issuance, and STILL be left with $60,000 in your pocket.
I think we all know what you would do.......
I made those assumptions because 1) they're more conservative and 2) they're easier. You're right that he would likely have more BTC available and will be in a much better position come October (or December, or February). Either way, Giga is in a great position here. He's likely to be first in line for MiniRig SC, so he'll make a killing when difficulty only doubles before it really explodes. If he doesn't offer the upgrade he was talking about, he has a huge farm that will probably stay current for a very long time in BTC terms for nothing out of pocket. If he does offer the upgrade path for a fee, he'll collect all the fees to his own pocket. Either way, win for him. He took the risk back in February to preorder the Minirigs and issue the bonds even though BFL Singles deliveries and specs were a clusterfuck, and he was rewarded for it.
He spent none of his money so had no risk.