I have S5, S5+, SP20, Neptunes and C1 for sale here in Venezuela. Immediate delivery. 0 wait. PM if you are interested.
At first I thought if electricity is free then it's %100 chance of profit but then I see this message. If you have mining equipment in Venezuela and you try to sell I think it's not that profitable to mine at all. Selling equipment make you more profit.
I think if OP is serious about that he should try with smaller equipment first and see the income as notlist3d said.
If "free" it really is a huge deal. To be able to pick gear spead over efficiency. It really is as close to guaranteed in bitcoin as it comes, as you can run forever (depends on miner some last longer then others).
The only thing is things such as value you have no control. So if bitcoin takes a downturn and you bought before it.... even free could lose money. But free have a huge step up.