You mean you're "stealing" electricity. No such thing as "free".
As what somebody else said, they could have a job that lists in the contract paid housing and expenses like electricity. Also, I've actually seen landlords trying to rent out residential properties with added bonuses such as free electricity or other utilities included. Obviously those may be capped to a certain amount, but free electricity does exist without having to steal it. Just somebody else has to pay for it
I have 4x 3GB amd radeon sapphire r9 280x dual x that I could ship for $120 each, no extra shipping cost. They mined many years ago for a few months at good temperatures. Looks like a broken one is listed at $80 and pre owned ones are $148 + $15 shipping so $163.