Sort:  

If I were you I'd get another 10 set ups just like that. Profit per year $57,456.85

I have a feeling his landlord will notice if he goes 10x but maybe double is possible? I mine with an old Antminer s4 myself and when it's free electricity it's cool to get some tokens for "nothing" :)

I wish I had something to mine with and knew how to do it. How often do you get free coins? What types of currencies do you mine for?

I mine ZCASH, this pays out about £80/$90 per week. It's about 200 days till ROI.

It's seems like your set up is quite expensive to buy. Probably not a good idea for regular people like me then eh? I hope you get your ROI and continue to make profits afterwards. I wish I knew more about computers.