I never said it won't double in the next month or next. I'm saying after a while, it's bloody hard to keep doubling. Please read before replying or please point to where I said it won't double next month.
3rd world English?

Let's have a look at your trusty genesis mining cal.
http://mining.thegenesisblock.com/a/59a54f942bYeah after 4-5 months, you won't really know what it will be like but the chances of it doubling and doubling and doubling is extremely unlikely.
Who's got 3rd world maths here?
You do, your arguing about roi. If it doubles this month, there is 0 ROI. You will lose money.