Mr. Teal
.135 per kwh is pretty high however i think your math is off a bit
a general rule of thumb is 1w ='s 1 GH the latest hardware is a bit more efficent than that. That fits the antminer S2 example but lets use that for siplicity and for sake of not breaking out a calculator, cant find mine its in a junk drawer somewhere and I am to lazy to open the one on my desktop
so 2 antminer s2's as I mine a averag 1 BTC per month with 1.5 Th/s
so 2000 GH/s ='s 2000 or 2KW
2kw x .14 kwh ='s .28 per hr x 24 hrs = 5.60 per day x 30 days = 168 per month
Mines say 1.2 (should be higher at 2 TH/s) BTC todays price $270 so $326 approximately once again not getting out a calculator
326$ - $168 ='s $158 profit @ $250 per BTC ='s $300 - $168 electricity ='s $132 profit Not much a difference between 270/250 BTC value
now for shits and giggles lets multiply that by 10 x thats 1300+k per month not a bad side income.
Yesterday was a great day at slushes I mined over .06 BTC for 3.5 TH/s
so lets use the S2 example again
3500 kw @ .10kwh
.35 per hour x 24 hrs ='s 8.40 8.40 x 30 ='s 252
.o6 BTC right now ='s like $17
$17 x 30 = $510 - 252 electricity ='s $258 profit
Now I run 5 x antminer s3+'s and a antminer c1 I just got in around the dec 27th all of them a bit more efficent than 1w per GHS plus I only use platinum rated PSU's plus I take every other pratical measure to reduce my familys electricity consumption LED light bulbs shutting lights off and appliances etc. its a never ending task they all know how to turn a switch on but none of them know how to turn a switch off haha
And also because its winter and I have this toasty farm running I have yet to turn my heater on I just turned my mining rig around
so that in itself is compensating for electricity I would of been running the heater
Naturally this all hinges on a steady stream of luck here at slushes because a few days of a long block and it totally ruins the equation and eats up the profits. Now that alone draws me to the larger pools as they are steadier but the payouts are less because its a percentage of the pool and with such a larger pool my little 3.5 TH/s isnot a very large percentage so i do better here at slushs and do the daily Block finding dance
In the end though if your spending more on electricity than your bringing in yes by all means makes no sense. Either time to find cheaper or free energy alternatives, or get more efficient hardware, I.e. move to saudi arabia eneergy is free and get some S5's they are pretty efficient thats my next purchase