Quote from: SebastianJu on April 10, 2013, 06:40:46 PM

It doesnt make sense to take the exchange price into account. Simply because the following.
You invest 100BTC into an avalon. A BTC is worth $10 at that time. That makes the machine $1000. You earn 5BTC with that machine while the exchange price is $200. And you already have your investment back. But that isnt correct. Because you invested BTC. If you would have kept the BTC and didnt buy the Asic then you would now have $20000. So a miner has always to beat the buyingprice you paid in BTC. Otherwise you lose. Or you would have been better to keep your bitcoins and see the exchange price and the worth rise.

The same applies to Asicminer shares. If you got your initial investment IN BTC back youre fine. Otherwise you would have been better to keep the BTC.

Everything that is beyond the buyingprice is additional and can be calculated in whatever you like. But an investment in BTC has to come back in BTC.

thank you for the sanity SebastianJu. ROI can only be measured in BTC if BTC was spent.

this analogy:

Quote from: Wayne_Chang on April 10, 2013, 07:58:22 AM

Why we have to compare the investment by BTC?
Think about if you invest gold or silver, how you judge win or lose?

should be more like this:
I sell 100 gold bars to build a gold mining operation.
My mining operation uncovers 80 gold bars.
Did I make my ROI?

No I did not.

The price of gold bars increasing or decreasing does not change that. *edit* Nor does it matter what price I bought those original gold bars for. You were right the first time SolarSilver

Even Yifu from Avalon measured ROI in BTC, not the dollar/euro value, etc.

"The price of each unit is the current mining difficulty which at the time of writing, just got readjusted to about 6,695,826. We take that number and multiply it by two ( predicting the network speed will double. ) and calculate the return in a thirty day window, which is about 75 bitcoins."
http://launch.avalon-asics.com/

In all of this, (and the jealous whining, lol) the OP's original question seems to have been lost. How many GPU miners it would take to make life difficult for batch 3 recipients is an interesting one but beyond my skill to figure out, sadly. Hopefully too many for it to be any concern