how do you estimate the cost?

Update about actual average ROI coin mining cost by coin.

0.0042 USD
OR
0.00000053 BTC

Number of coin I mine by day on the pool vs cost by day electricity/internet. I add a factor for the hardware cost spread on 3 years.

I wouldn't even quote the cost of the internet cost since its an everyday thing unless you're paying per GB?

I think even you're paying in GB typically miners just consume around <0.3MB per hour.

Yep, that's my point. There really is no point of calculating the cost of that. Did you also calculate in the heat/AC? Lips sealed