Would you rather make $86/day and pay $30/day for power = profit of $56 or
make $43/day and pay $5 for power = profit of $38
You see, you're quoting ratios, something/something. And that counts most. Single parameter like performance or power or price means nothing.
I would choose 86$/day @ 10$/day of power. Profit = 76$.
Your ratio is not possible. The ratio that doesn't change to higher, but only to lower is 6/2.
6x lower power at 2x lower performance, which would be difficult to achieve, it most likely be only 3/2-4/2 if you include supporting electronics, which will make even less profit if running chip at lower voltage vs running same chip at standard voltage. Why do you think Intel, AMD, Cray, IBM and everyone else who needs more performance than save battery does high integration and most power. New Cray multi-die chip made by IBM is 560W and there are 4 of them on a motherboard.
In your example if $86/day @ $10/day = $76 is low power, then
high power will be $172/day @ $60/day = $112 in profit
A bit early to tell, but I think my first order of wafers is going to be 30 PetaHash = 30,000,000 GH, by the end of next year it certainly be in 1,000 PH range, god only know what Knc/Kcn will come up with