ok - I was unclear if the agreement allowed you to keep any portion of the revenue being generated. Are you compensated for the cost to run the miners?
Nope. All electricity costs have always come out of my own pocket. I know it seems odd that people would attack someone for running miners for others behalf and paying all the associated costs for them, but that's literally what is occurring here.
as for the ROI aspect, until the seats are worth more BTC than they cost (being worth more USD is irrelevant) the ROI is negative.
This is a dangerous statement that could potentially land you in big trouble with the tax reporting agencies in your country. If you claim a loss of funds to your government's tax agency the way people claim it on this thread, you will likely face penalty as you should be claiming your fiat gains. Stating otherwise is a dangerous claim that could land people in hot water if they listen to you, so be careful.