These BF1 miners are pretty sweet, would take over 30 block erupter USBs to equal what I have in this pic
So, you paid $280 for bitcoins that are worth $140. Did you know that hardware would never ROI when you bought it?.
So you can predict long term price and difficulty?
Cool, you should be rich soon.
Yes. I can. Difficulty will rise exponentially. You can calculate how many BTC you will get from any mining equipment. If the mining equipment gives you less BTC then you would get if you bought it directly on an exchange, you lose.
If you need any more explanation let me know.