At a diff increase of only 15%
6TH in September will get you 7+ BTC by the end of the year
3TH now will get you 10+ BTC by the end of the year.
3TH now + 3TH in August will get you 16+ BTC by the end of the year
I trust you can do the basic maths and compare this to the number of BTC you could buy now with the same $$$
I see that you can do basic math which is good, but you are forgetting something.
You really should learn to pick your arguments RoadStress
6TH @ $4500, 18% increase in difficulty, $.15kwh electricity cost, starting in 45 days (early-mid August) will earn less than 7 BTC before it is operating in the
RED. At today's BTC prices, you could purchase more BTC than the SP30 will earn before it becomes a boat anchor.
Presumably, since you are a genius at math, you have figured this out for yourself. The only question we are all asking is why are you shilling so hard for SP30 machines when you know buying BTC is a better option. We're guessing its because you profit from it.
As an on-topic comment, it is clear that a Neptune @ similar prices is in a similarly disadvantaged situation.