ok so I added the miners to ghash.io

I don't know how to put in the electricity / alarm system costs. For the 2% is fine for calculations because if you have 39 shares of 390 shares that's 10% and less 2% of that is 9.8% but how do I put in cost for electricity / alarm because it's in USD and it's always changing due to increase in BTC. Can we just make my life easier and do 5% and so that would cover gas or I have to go home from work to manually turn on the machines again if they bug out like the several times it has happened? Do you guys think that would balance it out? That would save me the headache of splitting off 2% for BTC Talk members and 5% for FB members. Thoughts?